CN106960715A

CN106960715A - Common-mode filter

Info

Publication number: CN106960715A
Application number: CN201710166554.2A
Authority: CN
Inventors: 友成寿绪; 小林努; 有光统; 有光一统; 小间屋佑磨
Original assignee: TDK Corp
Current assignee: TDK Corp
Priority date: 2012-12-19
Filing date: 2013-12-19
Publication date: 2017-07-18
Anticipated expiration: 2033-12-19
Also published as: US9659701B2; DE102013114352A1; CN103887040B; DE102013114352B4; US20170221626A1; US10600555B2; CN203746604U; CN103887040A; US20140167903A1; US11636973B2; KR101468821B1; CN106960715B; KR20140079727A; US20200185145A1; CN106920627B; CN106920627A

Abstract

Common-mode filter (1) possesses the 1st and the 2nd coiling (W1, W2) that core (11a) is wrapped around with the identical number of turn.Coiling (W1, W2) is respectively with the number of turn (m₁) the 1st wrapping range (AR1) is wound in, with the number of turn (m₂) it is wound in the 2nd wrapping range (AR2).N-th of coiling (W2) in wrapping range (AR1)₁Circle (1≤n₁≤m₁1) with the n-th of coiling (W1)₁Wire spacing (D between+1 circle₁) it is shorter than the n-th of coiling (W1)₁Circle and the n-th of coiling (W2)₁Wire spacing (D between+1 circle₂).In addition, n-th of coiling (W1) in wrapping range (AR2)₂Circle (m₁+1≤n₂≤m₁+m₂1) with the n-th of coiling (W2)₂Wire spacing (D between+1 circle₃) it is shorter than the n-th of coiling (W2)₂Circle and the n-th of coiling (W1)₂Wire spacing (D between+1 circle₄)。

Description

Common-mode filter

The application isOn December 19th, 2013, Application No.201310704650.X, it is entitledCommon mode Wave filterPatent application divisional application.

Technical field

The present invention relates to the coiling structure of common-mode filter, more particularly to common-mode filter.

Background technology

It is known to have 2 signal wires of the transmission line for being respectively arranged at composition differential transmission mode and by mutual magnetic coupling 2 inductance constitute common-mode filter.By the way that common-mode filter to be inserted into the transmission line of differential transmission mode, so as to Enough noise currents for optionally only removing common mode.

It is used as the specific construction of common-mode filter, it is known to the construction using toroidal cores and the construction using cydariform core. Using in the case of toroidal cores, because very close to each other and with high actual effect permeability in core inner, it is thus possible to obtain High noise removing performance, on the other hand, has to rely on manual coiling, so characteristic is inclined because automatic winding is difficult Difference becomes big.In contrast, in the case of using cydariform core, obtaining the high noise removing performance of degree as toroidal cores is Difficult, on the other hand, automatic winding process can be used, so the deviation of characteristic can be reduced.In addition, because can Using automatic winding process, so the common-mode filter of cydariform core pattern is suitable for volume production.

In No. 3973028 publications of No. 4789076 publications of Japanese Patent No. and Japanese Patent No., disclose and use cydariform The example for the common-mode filter that core is constituted.In the example of No. 4789076 publications of Japanese Patent No., 2 of each inductance are constituted Coiling is wound with 2 layers of construction.On the other hand, in the example of No. 3973028 publications of Japanese Patent No., each inductance is constituted 2 coilings are simultaneously wound as pairing line.In general, the former method for winding is referred to as a layer winding, the latter around Line method is referred to as two-wire winding method.In addition, in No. 4737268 publications of Japanese Patent No., disclosing to carry out to cydariform The winding of the coiling of core and the example of automatic coil winding machine used.

But, in recent years, constantly using the Ethernet (Ethernet) in vehicle-mounted LAN.For for vehicle-mounted ether For the common-mode filter of net, performance is reduced than the existing characteristic more to be aspired for stability and high noise.It is related to this, cydariform core pattern Common-mode filter there is speciality in terms of it can reduce the deviation of characteristic as previously discussed.If it is possible to improve drum If the noise reduction performance of the common-mode filter of shape core pattern, then result in and be total to as the most suitable of vehicle-mounted Ethernet Mode filter.

What is specifically pursued as high noise reduction performance is to be input into the differential signal of common-mode filter In (differential signal) composition, represent the patten transformation characteristic of ratio that is converted into common-mode noise and is output (Scd) reduction.Therefore, the research that the present inventor is concentrated one's attention on to solve the technical problem, its result is sentenced Understand largely involves in the mutual of a pair of coilings for the reduction of the patten transformation characteristic in common-mode filter The balance of electric capacity (hereinafter referred to as " different turn-to-turn capacitance ") produced by between different circles (turn).In addition, also requiring high inductance Value, therefore, its very wise move is to increase the number of turn of coil.

The content of the invention

Therefore, it is to provide one kind to be produced on a pair of coils respectively by obtaining that an object of the present invention, which is, The balance of raw different turn-to-turn capacitance carrys out the reduction of implementation pattern transfer characteristic and can realize being total to for the cydariform core pattern of high inductance Mode filter.

In order to solve the above-mentioned technical problem, the common-mode filter involved by the 1st side of the invention is characterised by, tool It is standby：Core, has the 1st and the 2nd wrapping range respectively in a side of long side direction and another side；1st coil, by The 1st coiling for being wound in the core is constituted；2nd coil, by be wound in the 1st coiling identical number of turn 2nd coiling of the core is constituted；1st coiling has with the 1st number of turn m₁(m₁For positive number) it is wound in the described 1st 1st coiling pattern of wrapping range, with the 2nd number of turn m₂(m₂For positive number) it is wound in the 2nd winding diagram of the 2nd wrapping range Case, the 2nd coiling has with the 1st number of turn m₁It is wound in the 3rd coiling pattern of the 1st wrapping range, with described 2nd number of turn m₂The 4th coiling pattern of the 2nd wrapping range is wound in, in the 1st wrapping range, the 2nd coiling N-th₁Circle (n₁For more than 1 m₁Arbitrary number below -1) with the n-th of the 1st coiling₁The 1st wire spacing D between+1 circle₁It is short In the n-th of the 1st coiling₁Circle and the n-th of the 2nd coiling₁The 2nd wire spacing D between+1 circle₂, in the described 2nd winding Region, the n-th of the 1st coiling₂Circle (n₂For m₁More than+1 m₁+m₂Arbitrary number below -1) with the n-th of the 2nd coiling₂+ The 3rd wire spacing D between 1 circle₃It is shorter than the n-th of the 2nd coiling₂Circle and the n-th of the 1st coiling₂The 4th between+1 circle Wire spacing D₄。

In the 1st wrapping range across the n-th of the 2nd coiling₁Circle and the n-th of the 1st coiling₁Distribution electricity produced by between+1 circle Rong Bian great, but because in the 2nd wrapping range across the n-th of the 1st coiling₂Circle and the n-th of the 2nd coiling₂Produced by between+1 circle Distribution capacity becomes big, so the both sides relative to the 1st and the 2nd coiling can equably produce different turn-to-turn capacitance, and energy Enough suppress the imbalance of the impedance of the 1st and the 2nd coiling.Therefore, it is possible to reduce patten transformation characteristic Scd and height can be realized The common-mode filter of quality.

In the present invention, the 1st and the 2nd coiling preferably by two-wire winding in the core.In the case, it is excellent Choosing, in the 1st wrapping range, the same circle of the 1st coiling and the 2nd coiling is located at the core separately from each other One side and the another side, in the 2nd wrapping range, the same circle of the 1st coiling and the 2nd coiling It is located at the another side of the core and a side separately from each other.According to the structure, employ two-wire around Patten transformation characteristic Scd can be reduced in the common-mode filter of group, and the common-mode filter of high-quality can be realized.

In the present invention, it is preferred to, the 1st and the 2nd coiling composition is directly wound in the surface of the core 1st layer of wire winding layer and by overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, it is described in the 1st wrapping range 1st~the m of the 1st coiling₁Circle is directly wound in the surface of the core and constitutes the 1st layer of wire winding layer, the described 2nd 1st~the m of coiling₁- 1 circle is wound in the 1st layer of wire winding layer and is constituted the 2nd layer of wire winding layer by overlapping, the described 2nd around The m of line₁Circle is while be adjacent to the m of the 1st coiling₁Circle is while be directly wound in the surface of the core, described 2nd wrapping range, the m of the 1st coiling₁+ 1~the m₁+m₂Circle is directly wound in the surface of the core and constitutes institute State the 1st layer of wire winding layer, the m of the 2nd coiling₁+ 1 circle is while be adjacent to the m of the 1st coiling₁+ 1 circle is while directly rolled up It is around in the surface of the core, the m of the 2nd coiling₁+ 2~the m₁+m₂Circle is wound in the 1st layer of wire winding layer by overlapping And constitute the 2nd layer of wire winding layer.In this case, it is preferable to the 1st~the m of the 2nd coiling₁- 1 circle is while be embedded into by institute State between the mountain valley of the same circle of the 1st coiling and the 1st layer of wire winding layer of next circle formation while wound, the described 2nd around The m of line₁+ 2~the m₁+m₂Formed by the same circle and previous circle of the 1st coiling described 1st layer of circle while be embedded into around While being wound between the mountain valley of line layer.According to the structure, employ 2 layer by layer around common-mode filter in, mould can be reduced Formula transfer characteristic Scd and the common-mode filter that high-quality can be realized.In addition, according to the structure, in the 1st and the 2nd winding In the both sides in region, because mainly being constituted the 1st layer of wire winding layer with the 1st coiling and mainly being constituted the 2nd layer of coiling with the 2nd coiling Layer, so coiling structure is fairly simple and can easily wind the 1st and the 2nd coiling.

In the present invention, it is preferred to, the 1st and the 2nd coiling composition is directly wound in the surface of the core 1st layer of wire winding layer and by overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, it is described in the 1st wrapping range 1st~the m of the 1st coiling₁Circle is directly wound in the surface of the core and constitutes the 1st layer of wire winding layer, the described 2nd 1st circle of coiling is adjacent to the 1st circle of the 1st coiling while being directly wound in the surface of the core, described 2nd~the m of the 2nd coiling₁Circle is wound in the 1st layer of wire winding layer and is constituted the 2nd layer of wire winding layer by overlapping, described 2 wrapping ranges, the m of the 1st coiling₁+ 1~the m₁+m₂Circle is directly wound in the surface of the core and constituted described 1st layer of wire winding layer, the m of the 2nd coiling₁+ 1~the m₁+m₂- 1 circle is wound in the 1st layer of wire winding layer and constituted by overlapping The 2nd layer of wire winding layer, the m of the 2nd coiling₁+m₂Circle is while be adjacent to the m of the 1st coiling₁+m₂Circle is while straight Connect the surface for being wound in the core.In this case, it is preferable to the 2nd~the m of the 2nd coiling₁Circle while be embedded into by While being wound, the described 2nd between the mountain valley of the same circle of 1st coiling and the 1st layer of wire winding layer of previous circle formation The m of coiling₁+ 1~the m₁+m₂- 1 circle is while be embedded into the described 1st formed by the same circle and next circle of the 1st coiling While being wound between the mountain valley of layer wire winding layer.According to the structure, employ 2 layer by layer around common-mode filter in, can drop Low mode transfer characteristic Scd and the common-mode filter that high-quality can be realized.In addition, according to the structure, the 1st and the 2nd In the both sides of wrapping range because it is main with the 1st coiling constituted the 1st layer of wire winding layer and it is main with the 2nd coiling constituted the 2nd layer around Line layer, so coiling structure is fairly simple and can easily wind the 1st and the 2nd coiling.

In the present invention, it is preferred to, the 1st and the 2nd coiling composition is directly wound in the surface of the core 1st layer of wire winding layer and by overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, it is described in the 1st wrapping range 1st~the m of the 1st coiling₁Circle is directly wound in the surface of the core and constitutes the 1st layer of wire winding layer, the described 2nd 1st~the m of coiling₁- 1 circle is wound in the 1st layer of wire winding layer and is constituted the 2nd layer of wire winding layer by overlapping, the described 2nd around The m of line₁Circle is while be adjacent to the m of the 1st coiling₁Circle is while be directly wound in the surface of the core, described 2nd wrapping range, the m of the 2nd coiling₁+ 1~the m₁+m₂Circle is directly wound in the surface of the core and constitutes institute State the 1st layer of wire winding layer, the m of the 1st coiling₁+ 1~the m₁+m₂- 1 circle is wound in the 1st layer of wire winding layer and structure by overlapping Into the 2nd layer of wire winding layer, the m of the 1st coiling₁+m₂Circle is while be adjacent to the m of the 2nd coiling₁+m₂Circle one side quilt Directly it is wound in the surface of the core.In this case, it is preferable to the 1st~the m of the 2nd coiling₁- 1 circle is while embedded To between the mountain valley of the 1st layer of wire winding layer formed by the same circle and next circle of the 1st coiling while wound, it is described The m of 1st coiling₁+ 1~the m₁+m₂- 1 circle is while be embedded into as described in forming the same circle and next circle of the 2nd coiling While being wound between the mountain valley of 1st layer of wire winding layer.According to the structure, employ 2 layer by layer around common-mode filter in, can Reduce patten transformation characteristic Scd and the common-mode filter of high-quality can be realized.

In the present invention, it is preferred to, the 1st and the 2nd coiling composition is directly wound in the surface of the core 1st layer of wire winding layer and by overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, it is described in the 1st wrapping range 1st~the m of the 1st coiling₁Circle is directly wound in the surface of the core and constitutes the 1st layer of wire winding layer, the described 2nd 1st circle of coiling is adjacent to the 1st circle of the 1st coiling while being directly wound in the surface of the core, described 2nd~the m of the 2nd coiling₁Circle is wound in the 1st layer of wire winding layer and is constituted the 2nd layer of wire winding layer by overlapping, described 2 wrapping ranges, the m of the 2nd coiling₁+ 1~the m₁+m₂Circle is directly wound in the surface of the core and constituted described 1st layer of wire winding layer, the m of the 1st coiling₁+ 1 circle is while be adjacent to the m of the 2nd coiling₁+ 1 circle is while directly wound In the surface of the core, the m of the 1st coiling₁+ 2~the m₁+m₂Circle is wound in the 1st layer of wire winding layer simultaneously by overlapping Constitute the 2nd layer of wire winding layer.In this case, it is preferable to the 2nd~the m of the 2nd coiling₁Circle is while be embedded into by described While being wound between the mountain valley of the same circle of 1 coiling and the 1st layer of wire winding layer of previous circle formation, the 2nd coiling M₁+ 2~the m₁+m₂Circle is while be embedded into the 1st layer of wire winding layer formed by the same circle and previous circle of the 1st coiling Mountain valley between while being wound.According to the structure, employ 2 layer by layer around common-mode filter in, pattern can be reduced and turned Change characteristic Scd and the common-mode filter of high-quality can be realized.

In the present invention, the core, which is preferably further included, is located at the 1st wrapping range and the 2nd winding area Area of space (space area) between domain.Area of space is being arranged between the 1st wrapping range and the 2nd wrapping range In the case of, can be intersected the 1st and the 2nd coiling in the area of space.Therefore, it is possible to easily realize the 1st and 2 coiling blocks that the position relationship of 2nd coiling is turned around mutually, and the influence of different turn-to-turn capacitance can be substantially reduced.

In the present invention, the 1st number of turn m₁With the number of turn m₂Difference be preferably the 1st coiling W1 or the 2nd coiling W2 Less than the 1/4 of total number of turns.In the case, the 1st number of turn m₁With the 2nd number of turn m₂Difference be preferably below 2 circles, it is described 1st number of turn m₁With the 2nd number of turn m₂Difference be more preferably below 1 circle, particularly preferred 1st number of turn m₁With the 2nd circle Number m₂Identical (m₁=m₂)。

In the present invention, it is preferred to, the 1st and the 3rd coiling pattern constitutes the 1st coiling block, the described 2nd and the 4th around Line pattern constitutes the 2nd coiling block, and the core is provided with what multiple combinations by the 1st and the 2nd coiling block were constituted Unit coiling structure.In the case where the number of turn of the 1st and the 2nd coiling is very more and by its fine feelings split Under condition, the situation than coarse segmentation is better able to improve the balance of different turn-to-turn capacitance.Therefore, it is possible to reduce patten transformation characteristic Scd and the common-mode filter that high-quality can be realized.

In the present invention, it is preferred to, the 1st and the 3rd coiling pattern constitutes the 1st coiling block, is configured in than the described 1st Coiling block closer to the axial center of the core and with the coiling structure different from the 1st coiling block the 3rd Coiling block, the 2nd and the 4th coiling pattern constitutes the 2nd coiling block, is configured in than the 2nd coiling block closer to described The axial center of core and the 4th coiling block with the coiling structure different from the 2nd coiling block, the described 1st with And the 2nd coiling block have 2 layer by layer around construction, the 3rd and the 4th coiling block has individual layer two-wire around set constructor, the described 1st around Line block and the 3rd coiling block are split by the 1st subspace (subspace), and the 2nd coiling block and the 4th coiling block are by Split 2 subspaces.According to the structure, can zero it is scrappy brokenly by multiple spaces be arranged at the 1st coiling block and the 2nd coiling block it Between, contracted when the 1st coiling and the 2nd coiling is intersected on border of the 1st wrapping range with the 2nd wrapping range It is short from prechiasmal circle to intersection after circle displacement.That is, can be between the wrapping range of constriction the 1st and the 2nd wrapping range Space width, and can reduce during the operating winding of coiling has just made the 1st coiling and the 2nd coiling carry out intersection The deviation of the winding start position of circle afterwards.

In the present invention, it is preferred to, at least one adjoining circle of the 3rd coiling block is split by the 3rd subspace, and the described 4th At least one adjoining circle of coiling block is split by the 4th subspace., can be further zero scrappy brokenly by multiple skies according to the structure Between be arranged between the 1st coiling block and the 2nd coiling block, when make on the border of the 1st wrapping range and the 2nd wrapping range the 1st around Line and the 2nd coiling can further shorten from prechiasmal circle to intersection when intersection after circle displacement.That is, Space width that can further between the wrapping range of constriction the 1st and the 2nd wrapping range, and in the operating winding process of coiling In can further reduce just make the 1st coiling and the 2nd coiling intersected after circle winding start position deviation.

In order to solve the above-mentioned technical problem, the common-mode filter involved by the 2nd side of the invention is characterised by, tool It is standby：Core, has the 1st and the 2nd wrapping range respectively in a side of long side direction and another side；1st coil, by The 1st coiling for being wound in the core is constituted；2nd coil, by be wound in the 1st coiling identical number of turn 2nd coiling of the core is constituted；1st coiling has the 1st winding diagram for being wound in the 1st wrapping range Case, the 2nd coiling pattern for being wound in the 2nd wrapping range, the 2nd coiling, which has, is wound in the 1st winding area The 3rd coiling pattern in domain, the 4th coiling pattern for being wound in the 2nd wrapping range, by the 1st and the 3rd coiling pattern The coiling structure and the coiling structure for the 2nd coiling block being made up of the 2nd and the 4th coiling pattern of the 1st coiling block constituted Border relative to the 1st and the 2nd winding area is mutually symmetrical with shape, on the long side direction the described 1st and The position of the same circle of 3rd coiling pattern is mutually different, the 2nd and the 4th coiling pattern on the long side direction it is same The position of one circle is mutually different.

The coiling structure obtained by the 1st and the 2nd coiling is in the position relationship comprising coiling as symmetrical feelings Under condition because different turn-to-turn capacitance is equably produced relative to the both sides of the 1st and the 2nd coiling, can suppress the 1st and The imbalance of the impedance of 2nd coiling.Therefore, it is possible to reduce patten transformation characteristic Scd and the common mode filter of high-quality can be realized Ripple device.

In the present invention, the core, which is preferably further included, is located at the 1st wrapping range and the 2nd winding area Area of space between domain., can in the case where area of space is arranged between the 1st wrapping range and the 2nd wrapping range Symmetrical coiling structure is easily realized into as benchmark in the border of 2 wrapping ranges, and can fully be reduced The influence of different turn-to-turn capacitance.Therefore, it is possible to fully reduce Scd and the common-mode filter of high-quality can be realized.

In the present invention, the 1st coiling is preferably wound in the 1st layer on the core, and the 2nd coiling is preferred It is wound in the 2nd layer on described 1st layer.According to the structure, can so-called layer around coiling structure in reduction Scd and energy Enough realize the common-mode filter of high-quality.

The number of turn of 1st to the 4th coiling pattern is preferably being set to n circles (n is positive number) by the common-mode filter of the present invention When, in the 1st wrapping range, it is wound with the 1st coiling pattern of n circles in the level 1 volume and is wound with 1 circle The 3rd coiling pattern, the 3rd coiling pattern of n-1 circles is wound with the level 2 volume, in the 2nd wrapping range, The level 1 volume is wound with the 2nd coiling pattern of n circles and is wound with the 4th coiling pattern of 1 circle, at described 2nd layer It is wound with the 4th coiling pattern of n-1 circles.According to the structure, the winding for considering the 2nd layer in advance be squashed it is real around It can be realized in line construction symmetrical.Therefore, it is possible to seek Scd reduction and the common mode filtering of high-quality can be realized Device.

In the present invention, it is preferred to be wound in described 1st layer of the 3rd coiling pattern of the 1st wrapping range 1 circle is provided adjacent to most connect in described 1st layer of the 1st coiling pattern for being wound in the 1st wrapping range The circle of the described one end being bordering on the long side direction, be wound in described 1st layer of the 2nd wrapping range the described 4th 1 circle of coiling pattern is provided adjacent in described 1st layer of the 2nd coiling for being wound in the 2nd wrapping range Closest to the circle of the other end on the long side direction in pattern., can be by from the 2nd of the 2nd coiling the according to the structure Layer sets up the both ends for the long side direction for being placed in core 11a separately to the 1st layer of caught portion.Therefore, it is possible to seek Scd reduction simultaneously And the common-mode filter of high-quality can be realized.

In the present invention, it is preferred to be wound in described 1st layer of the 3rd coiling pattern of the 1st wrapping range 1 circle is provided adjacent to most connect in described 1st layer of the 1st coiling pattern for being wound in the 1st wrapping range The circle for the other end being bordering on the long side direction, be wound in described 1st layer of the 2nd wrapping range described 1 circle of 4 coiling patterns is provided adjacent in described 1st layer of the 2nd coiling for being wound in the 2nd wrapping range Closest to the circle of described one end on the long side direction in pattern., can be by from the 2nd of the 2nd coiling the layer according to the structure Set up the central portion for the long side direction for being placed in core 11a separately to the 1st layer of caught portion.Therefore, it is possible to seek Scd reduction and The common-mode filter of high-quality can be realized.

In the present invention, it is preferred to which the 1st and the 2nd coiling is alternately rolled up on the core on the long side direction Around.According to the structure, Scd can be reduced in the coiling structure of so-called two-wire winding and the common mode filtering of high-quality is realized Device.

In the present invention, it is preferred to which the core further includes the different from the 1st and the 2nd wrapping range the 3rd Wrapping range, the 1st coiling further comprising being wound in the 5th coiling pattern of the 3rd wrapping range, the described 2nd around Line is further comprising the 6th coiling pattern for being wound in the 3rd wrapping range.In the case, the 5th coiling pattern The number of turn is preferably less than half of the number of turn of the 1st coiling pattern, and the number of turn of the 6th coiling pattern is preferably the described 3rd Less than half of the number of turn of coiling pattern.Or, the number of turn of the 5th and the 6th coiling pattern is respectively preferably below 2 circles.

In accordance with the invention it is possible to provide it is a kind of can either implementation pattern transfer characteristic reduction and result in high inductance Common-mode filter.

Brief description of the drawings

Fig. 1 is the exterior structure for representing the surface installing type common-mode filter 1 involved by the 1st embodiment of the present invention General perspective view.

Fig. 2 is the basic circuit diagram of common-mode filter 1.

Fig. 3 A and Fig. 3 B are compared with the more detailed equivalent circuit figure of common-mode filter 1 represented by Fig. 2.

Fig. 4 A and Fig. 4 B are for illustrating the ideograph on the distribution capacity between a pair of coilings.

Fig. 5 A and Fig. 5 B are the equivalent circuit figures of the generation model for the distribution capacity for representing common-mode filter.

Fig. 6 is the sectional view for the coiling structure for schematically showing common-mode filter 1.

Fig. 7 is section for the coiling structure for schematically showing the common-mode filter 2 involved by the 2nd embodiment of the present invention Face figure.

Fig. 8 A~Fig. 8 D are the ideographs for illustrating the coiling structure of common-mode filter 2, and particularly Fig. 8 A~Fig. 8 C are The schematic diagram of the position relationship of the adjoining turn-to-turn of a pair of coilings is represented, Fig. 8 D are the schematic diagrames for illustrating different turn-to-turn capacitance.

Fig. 9 is section for the coiling structure for schematically showing the common-mode filter 3 involved by the 3rd embodiment of the present invention Face figure.

Figure 10 A~Figure 10 D are the ideograph for illustrating the coiling structure of common-mode filter 3, particularly Figure 10 A~figure 10C is the schematic diagram of the position relationship for the adjoining turn-to-turn for representing a pair of coilings, and Figure 10 D are the signals for illustrating different turn-to-turn capacitance Figure.

Figure 11 is the sectional view for the coiling structure for representing the common-mode filter 4 involved by the 4th embodiment of the present invention.

Figure 12 A~Figure 12 D are the ideograph for illustrating the coiling structure of common-mode filter 4, particularly Figure 12 A~figure 12C is the schematic diagram of the position relationship for the adjoining turn-to-turn for representing a pair of coilings, and Figure 12 D are the signals for illustrating different turn-to-turn capacitance Figure.

Figure 13 is the coiling structure for schematically showing the common-mode filter 5 involved by the 5th embodiment of the present invention Sectional view.

Figure 14 A~Figure 14 D are the ideograph for illustrating the coiling structure of common-mode filter 5, particularly Figure 14 A~figure 14C is the schematic diagram of the position relationship for the adjoining turn-to-turn for representing a pair of coilings, and Figure 14 D are the signals for illustrating different turn-to-turn capacitance Figure.

Figure 15 A and Figure 15 B are to schematically show the common-mode filter 6 involved by the 6th embodiment of the present invention The sectional view of coiling structure, particularly Figure 15 A are the sectional views for representing coiling structure, and Figure 15 B are to illustrate different turn-to-turn capacitance Schematic diagram.

Figure 16 is the coiling structure for schematically showing the common-mode filter 7 involved by the 7th embodiment of the present invention Sectional view.

Figure 17 is the coiling structure for schematically showing the common-mode filter 8 involved by the 8th embodiment of the present invention Sectional view.

Figure 18 is the coiling structure for schematically showing the common-mode filter 9 involved by the 9th embodiment of the present invention Sectional view.

Figure 19 is the detailed construction for schematically showing the common-mode filter 21 involved by the 10th embodiment of the present invention General plane figure.

Figure 20 A and Figure 20 B are that the rough cross-sectional view of the common-mode filter 21 represented by Figure 19, particularly Figure 20 A are edges A₁~A₁' line sectional view, Figure 20 B are along A₂~A₂' line sectional view.

Figure 21 is the rough cross-sectional view for the structure for representing the common-mode filter 22 involved by the 11st embodiment of the present invention.

Figure 22 is the rough cross-sectional view for the structure for representing the common-mode filter 23 involved by the 12nd embodiment of the present invention.

Figure 23 is the general plane figure for the structure for representing the common-mode filter 24 involved by the 13rd embodiment of the present invention.

Figure 24 A and Figure 24 B are that the rough cross-sectional view of the common-mode filter 24 represented by Figure 23, particularly Figure 24 A are edges A₁~A₁' line sectional view, Figure 24 B are along A₂~A₂' line sectional view.

Figure 25 is the general plane figure for the structure for representing the common-mode filter 25 involved by the 14th embodiment of the present invention.

Figure 26 A and Figure 26 B are that the rough cross-sectional view of the common-mode filter 25 represented by Figure 25, particularly Figure 26 A are edges A₁~A₁' line sectional view, Figure 26 B are along A₂~A₂' line sectional view.

Embodiment

Hereinafter, while the preferred embodiment of the present invention is described in detail on one side referring to the drawings.

Fig. 1 is the exterior structure for representing the surface installing type common-mode filter 1 involved by the 1st embodiment of the present invention General perspective view.Further, in the present embodiment, as shown in figure 1, by the relative of a pair of flanges portion 11b, 11c described below Direction is referred to as y directions, and x side is referred to as with the perpendicular direction in y directions in 11bs above, 11cs face by described below To both perpendicular directions with x directions and y directions are referred to as into z directions.

As shown in figure 1, common-mode filter 1 possesses cydariform core 11, the slab core 12 for being installed in cydariform core 11, is wound in The coiling W1, W2 (the 1st and the 2nd coiling) of cydariform core 11 and constitute.Cydariform core 11 possesses the bar-shaped core of rectangular cross-section Portion 11a, be arranged at core 11a two ends flange part 11b, 11c, and the construction being integrated with these components. Slab core 12 is mutually fixed with (face of 11bs above, 11cs opposite side) below flange part 11b, 11c.Common-mode filter 1 with Make 11bs above the flange part 11b, 11c of cydariform core 11, state relative with circuit substrate 11cs is surface mounted.

Cydariform core 11 and slab core 12 are by the higher magnetic material of permeability, such as Ni-Zn classes ferrite or Mn-Zn The ferritic sintered body of class is constituted.Further, the usual intrinsic resistance of the high magnetic material of the permeability of Mn-Zn classes ferrite etc. is low And it is conductive.

11bs is formed with 2 terminal electrodes E1, E2 above flange part 11b, and 11cs is formed above flange part 11c There are 2 terminal electrodes E3, E4.Terminal electrode E1, E2 are sequentially configured from a side in x directions by this.Equally, terminal electricity Pole E3, E4 are sequentially configured from a side in x directions by this.On terminal electrode E1~E4, coiling W1, W2 each end Portion is wired by being thermally compressed.

Coiling W1, W2 are covering wire, are wound in core 11a with the coiling direction being mutually identical and are constituted coil and lead Body.Coiling W1, the W2 number of turn are also identical each other.In the present embodiment, coiling W1, W2 are rolled up by the two-wire winding of individual layer Around.In addition, space (space) is arranged between core 11a substantially the center of adjacent circle, thus Special composition area Domain S1.On the point, it is described in detail again later.Part beyond area of space S1, adjacent circle is snugly into each other and is rolled up Around.Coiling W1 one end (end of flange part 11b sides) W1a, the other end (end of flange part 11c sides) W1b are wired respectively In terminal electrode E1, E3.In addition, coiling W2 one end (end of flange part 11b sides) W2a, the other end (flange part 11c sides End) W2b is wired to terminal electrode E2, E4 respectively.

Fig. 2 is the basic circuit diagram of common-mode filter 1.

It is connected to the inductor 10a between terminal electrode E1 and E3 as shown in Fig. 2 common-mode filter 1 has and is connected The mutual magnetic-coupled structures of inductor 10b being connected between terminal electrode E2 and E4.Inductor 10a, 10b respectively by coiling W1, W2 is constituted.By the structure by terminal electrode E1, E2 as input and by terminal electrode E3, E4 as output end feelings Under condition, the differential signal inputted from input is essentially unaffected due to common-mode filter 1 and is output from output end. On the other hand, big decay occurs due to common-mode filter 1 for the common-mode noise inputted from input, and substantially not to output end Output.

Here, common-mode filter typically has a part for the differential signal for the input that will be input into common-mode filter It is converted into common-mode noise and exports such property from output end.The property because of course not desired, it is therefore necessary to To be converted into the differential signal of common-mode noise ratio (above-mentioned patten transformation characteristic Scd) be suppressed to it is following to a certain degree Value.In addition, being separated with this, for common-mode filter, it is necessary to increase winding number as far as possible.In order to be obtained with small size Necessary inductance, in the common-mode filter 1 of present embodiment, makes coiling by the substantially intermediate location in its coiling direction W1, W2 position relationship turn around and release the bias of different turn-to-turn capacitance to solve the above problems.Hereinafter, carry out detailed Thin explanation.

Fig. 3 is compared with the more detailed equivalent circuit figure of common-mode filter 1 represented by Fig. 2.

As shown in Figure 3A, common-mode filter 1 also has the resistance R being in parallel with inductance L in addition to original inductance L₀ And electric capacity C₀.Further have across by coiling W1, the distribution capacity C produced between a pair of inductance L, L of W2 formation₁.Figure 3B is for convenience of description and Fig. 3 A common-mode filter 1 is divided into 2 pieces of schematic diagram, and divided inductance respectively becomes L/ 2.In addition, parallel resistance turns into R₀/ 2, shunt capacitance turns into 2C₀。

Fig. 4 is for illustrating the ideograph on the distribution capacity between a pair of coilings.

As shown in Figure 4 A, distribution capacity C is for example being produced between the same circle of a pair of coilings of two-wire winding₁, in neighbour Connect turn-to-turn interval d it is wider in the case of will not produce distribution capacity therebetween.On the other hand, as shown in Figure 4 B, in adjacent circle Between interval d it is narrower in the case of can produce distribution capacity (different turn-to-turn capacitance) C being distributed across adjacent turn-to-turn₂.That is, Distribution capacity C can be produced between a pair of coilings₁,C₂Both sides.

Fig. 5 is the equivalent circuit figure of the generation model for the distribution capacity for representing common-mode filter.

As shown in Figure 5A, in a pair of coiling W1 by implementing common two-wire winding, the common-mode filter that W2 is constituted, In the case where by a pair of coils (inductance L), position is divided into 2 parts therebetween, each coil turns into 2 inductance L/2 string Connection connection.Then, the distribution capacity C of same turn-to-turn is produced on a pair of coils₁With the distribution capacity C of adjacent turn-to-turn₂(reference picture 4).Here, distribution capacity C₂It is matched with the segmentation of coil and the distribution capacity C of a block can be divided into₂₁With point of another block Cloth electric capacity C₂₂, these distribution capacity C₂₁,C₂₂Coil with coiling W2 sides is produced with being in parallel, thus, is only by coiling W2 shapes Into the resonance point of lc circuit change, patten transformation characteristic Scd also becomes big.

On the other hand, as shown in Figure 5 B, a pair of coilings W1, W2 making to implement two-wire winding in centre position winding are suitable Sequence is turned around, in the case, the distribution capacity C of a block₂₁Produced with being in parallel with the coil of coiling W1 sides, another block Distribution capacity C₂₂Produced with being in parallel with the coil of coiling W2 sides.Thus, by the coiling W1 lc circuits formed resonance point and by The both sides of the resonance point of the lc circuit of coiling W2 formation change, but the balance of 2 resonance points does not change.Therefore, Scd can be reduced.In addition, because being capable of the interval d of constriction adjoining turn-to-turn, the number of turn can be increased to improve inductance.This is Due to even if constriction abuts the interval d of turn-to-turn and produces the distribution capacity C of adjacent turn-to-turn₂Also it can reduce as previously discussed Scd。

Further, the explanation of the above is the explanation in the case that 2 coilings are two-wire winding, but layer around situation also phase Together.Then, the construction of common-mode filter 1 is described in detail.

Fig. 6 is the sectional view for the coiling structure for schematically showing common-mode filter 1.Further, the figure is ideograph, its shape Shape, construction, position of each circle etc. are knifeedge different from material object.

As shown in fig. 6, common-mode filter 1 possesses is wound in the one of the core 11a of cydariform core 11 by two-wire winding To coiling W1, W2.So-called two-wire winding, refers to that one one is alternately arranged the 1st and the 2nd coiling coiling W1, W2 winding side Method, preferably uses combining closely for primary secondary in the case of necessary.

1st coiling W1 is from one end of core 11a long side direction towards the other end in order by winding so as to constitute the 1st Coil, the 2nd coiling W2 is in the state of parallel with the 1st coiling W1 from one end of core 11a long side direction towards another End is in order by winding so as to constitute and mutually magnetic-coupled 2nd coil of the 1st coil.Because the coiling direction of the 1st and the 2nd coil It is identical, so the direction of the magnetic flux produced by the electric current for flowing to the 1st coil and the magnetic flux produced by the electric current for flowing to the 2nd coil The direction of amount turns into identical, overall magnetic flux enhancing.1st and the 2nd coil constitutes common-mode filter by structure above.

1st coiling W1 and the 2nd coiling W2 is essentially the identical number of turn, and both preferably even number circle.Present embodiment Coiling W1, W2 all be 6 circles.Further, the number of turn can be increased as far as possible in order to improve inductance.

A pair of coiling W1, W2 are formed in the 1st wrapping range AR1 of a side of core 11a long side direction The 1st coiling block BK1 that is configured and in the 2nd wrapping range AR2 of the another side of the long side direction positioned at core 11a The 2nd coiling block BK2 being configured.Area of space S1 is provided between the 1st wrapping range AR1 and the 2nd wrapping range AR2, 1st coiling block BK1 and the 2nd coiling block BK2 are split by area of space S1.

1st wrapping range BK1 is made up of the combination of following coiling patterns：By with the 1st number of turn m₁=3 are wound in volume 1 Around region AR1 the 1st coiling W1 the 1st coiling pattern WP1 constituted and by equally with the 1st number of turn m₁=3 are wound in the 1st winding The 3rd coiling pattern WP3 that region AR1 the 2nd coiling W2 is constituted.In addition, combinations of the 2nd coiling block BK2 by following coiling patterns Constitute：By with the 2nd number of turn m₂=3 be wound in the 2nd wrapping range AR2 the 1st coiling W1 constitute the 2nd coiling pattern WP2 and By equally with the 2nd number of turn m₂The 4th coiling pattern WP4 that=3 the 2nd coiling W2 for being wound in the 2nd wrapping range AR2 are constituted.That is, 1st and the 2nd coiling W1, W2 the 1st~the 3rd circle constitute the 4th~the 6th of the 1st coiling block BK1, the 1st and the 2nd coiling W1, W2 Circle constitutes the 2nd coiling block BK2.

As illustrated, the coiling W1 in the 1st coiling block BK1, W2 same circle are located at left side and right side respectively, while dimension The position relationship is held while closely being wound, but reverse, coiling W1 occurs for position relationship on the 2nd coiling block BK2, W2's Same circle is located at right side and left side separately from each other, maintains the position relationship while closely being wound.

That is, the position of the core axial direction of the circle of the 1st, the 2nd and the 3rd relative to the 1st coiling W1 for constituting the 1st coiling block BK1 The left side (close to core 11a one end) for the circle of the 1st, the 2nd and the 3rd for being respectively the 2nd coiling W2 is put, the 2nd coiling block is constituted BK2 the 1st coiling W1 circle of the 4th, the 5th and the 6th core axial direction position be respectively the 2nd coiling W2 the 4th, the 5th and The right side of 6th circle (close to the core 11a other end).

As previously discussed in order that the 1st and the 2nd coiling W1, W2 position relationship reverse and are necessary from the 1st Intersected two coiling W1, W2 in the way that wrapping range AR1 is moved to the 2nd wrapping range AR2.Above-mentioned area of space S1 makees To make coiling W1, region that W2 is intersected and used.In addition, so making the 1st and the 2nd coiling W1, W2 carry out mutual In the case of intersection, the position relationship of coiling W1, W2 terminal part there occurs reverse compared with top portion, can then produce like this Life can not be connected to corresponding terminal electrode E3, E4 (reference picture 1) situation.In this case, it can make again Coiling W1, W2 terminal part are intersected and with being connected to terminal electrode E1, E2 coiling W1, the position in W2 top portion respectively Put relation identical (parallel).This is also identical in following represented other embodiment.

Then, in the present embodiment, in the 1st wrapping range AR1 the 2nd coiling W2 n-th₁Circle (n₁For more than 1 m₁-1 Following arbitrary number) with the n-th of the 1st coiling W1₁The 1st wire spacing D between+1 circle₁It is shorter than the n-th of the 1st coiling W1₁Circle with The n-th of 2nd coiling W2₁The 2nd wire spacing D between+1 circle₂.In addition, n-th of the 1st coiling W1 in the 2nd wrapping range AR2₂ Circle (n₂For m₁More than+1 m₁+m₂Arbitrary number below -1) with the n-th of the 2nd coiling W2₂The 3rd wire spacing D between+1 circle₃It is short In the n-th of the 2nd coiling W2₂The n-th of circle and the 1st coiling W1₂The 4th wire spacing D between+1 circle₄.Further, so-called " line spacing From " refer to the distances between centers (spacing) of 2 parallel coilings.Wire spacing D₁And D₃Equal to the 1st and the 2nd coiling W1, W2 Same circle on wire spacing.

For example, in the 1st wrapping range AR1, the 2nd coiling W2 the 1st circle is contacted with the 1st coiling W1 the 2nd circle, but 1 coiling W1 the 1st circle is not contacted with the 2nd coiling W2 the 2nd circle.Therefore, the 2nd of the 2nd coiling W2 the 1st circle and the 1st coiling W1 The 1st wire spacing D between circle₁It is shorter than the 2nd wire spacing between the 1st coiling W1 the 1st circle and the 2nd coiling W2 the 2nd circle D₂.Then, such relation is also set up between coiling W1, the W2 circles of 2- the 3rd.

On the other hand, in the 2nd wrapping range AR2, the 1st coiling W1 the 4th circle is contacted with the 2nd coiling W2 the 5th circle, but It is that the 2nd coiling W2 the 4th circle is not contacted with the 1st coiling W1 the 5th circle.Therefore, the 1st coiling W1 the 4th circle and the 2nd coiling W2 The 3rd wire spacing D between 5th circle₃It is shorter than the 4th line spacing between the 2nd coiling W2 the 4th circle and the 1st coiling W1 the 5th circle From D₄.Then, such relation is also set up between coiling W1, the W2 circles of 5- the 6th.

As previously discussed, in the 1st wrapping range AR1, the n-th of the 2nd coiling W2₁The n-th of circle and the 1st coiling W1₁+ 1 circle Capacitance Coupled becomes strong, and distribution capacity C₂₁Become big.On the other hand, in the 2nd wrapping range AR2, the n-th of the 1st coiling W1₂Circle With the n-th of the 2nd coiling W2₂The Capacitance Coupled of+1 circle becomes strong, and distribution capacity C₂₂Become big.In a word, between different circles And the distribution capacity (different turn-to-turn capacitance) produced is because relative to coiling W1, W2 both sides equably produce, so can press down Coiling W1 processed, the imbalance of W2 impedance.Therefore, it is possible to reduce patten transformation characteristic Scd and being total to for high-quality can be realized Mode filter.

Fig. 7 is section for the coiling structure for schematically showing the common-mode filter 2 involved by the 2nd embodiment of the present invention Face figure.In addition, Fig. 8 is the ideograph for illustrating the coiling structure of common-mode filter 2.

As shown in fig. 7, common-mode filter 2 possess by 2 layer by layer around and be wound in a pair of the core 11a of cydariform core 11 Coiling W1, W2.1st coiling W1 is wound and constitutes the 1st in order from one end of core 11a long side direction towards the other end Coil, the 2nd coiling W2 is also wound and constituted and the 1st coil phase magnetic coupling in order from core 11a one end towards the other end The 2nd coil closed.Because the coiling direction of the 1st and the 2nd coil is identical, the magnetic produced by the electric current for flowing to the 1st coil The direction of flux and the direction of the magnetic flux produced by the electric current for flowing to the 2nd coil turn into identical, overall magnetic flux enhancing.The 1 and the 2nd coil is made up of common-mode filter structure described above.

1st and the 2nd coiling W1, W2 are essentially the identical number of turn, and both preferably even number circle.Present embodiment around Line W1, W2 are 8 circles.Further, the number of turn can be increased as far as possible in order to improve inductance.

1st wrapping range BK1 is made up of the combination of following coiling patterns：By with the 1st number of turn m₁=4 are wound in volume 1 Around region AR1 the 1st coiling W1 the 1st coiling pattern WP1 constituted and by equally with the 1st number of turn m₁=4 are wound in the 1st winding The 3rd coiling pattern WP3 that region AR1 the 2nd coiling W2 is constituted.In addition, combinations of the 2nd coiling block BK2 by following coiling patterns Constitute：By with the 2nd number of turn m₂=4 be wound in the 2nd wrapping range AR2 the 1st coiling W1 constitute the 2nd coiling pattern WP2 and By equally with the 2nd number of turn m₂The 4th coiling pattern WP4 that=4 the 2nd coiling W2 for being wound in the 2nd wrapping range AR2 are constituted.That is, 1st and the 2nd coiling W1, W2 the 1st~the 4th circle constitute the 5th~the 8th of the 1st coiling block BK1, the 1st and the 2nd coiling W1, W2 Circle constitutes the 2nd coiling block BK2.

In the 1st coiling block BK1, the 1st coiling W1 the 1st~the 4th circle constitutes the surface for being directly wound in core 11a The 1st layer of wire winding layer, and it is online between be closely wound very close to each otherly.2nd coiling W2 the 1st~the 3rd circle constitutes quilt Overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, particularly while between the mountain valley being embedded between the 1st coiling W1 line While being wound.For example, the 2nd coiling W2 the 1st circle is located between the mountain valley between the 1st coiling W1 the 1st circle and the 2nd circle, the 2nd Circle is located between the mountain valley between the 1st coiling W1 the 2nd circle and the 3rd circle, and the 3rd circle is located at the 1st coiling W1 the 3rd circle and the 4th circle Between mountain valley between.So, the position of the axial direction (core 11a long side direction) of the 2nd coiling W2 each circle with the 1st around The position of line W1 same circle is inconsistent.

2nd coiling W2 the 4th circle and the 5th circle is directly wound in core can not wind not complete remaining circle on the 2nd layer Portion 11a surface simultaneously constitutes the 1st layer of wire winding layer.2nd coiling W2 the 4th circle is contacted with the side of the 1st coiling W1 the 4th circle and quilt Winding, and the part as the 1st coiling block BK1.2nd coiling W2 the 5th circle is contacted with the side of the 1st coiling W1 the 5th circle And wound, and the part as the 2nd coiling block BK2.

It is preferable that 2nd coiling W2 the 4th circle and the 5th circle was formed on the 2nd layer originally.But, by the 2nd layer of each circle In the case of being configured between the mountain valley of the 1st layer of adjoining turn-to-turn because lack support the 2nd coiling W2 remaining circle the 1st around One in line W1 2 circles, so the 2nd layer of position (position) can not be maintained.Therefore, it is right as the construction of reality In the 4th and the 5th circle, using from initially winding the state that is squashed.

In the 2nd coiling block BK2, the 1st coiling W1 the 5th~the 8th circle constitutes the surface for being directly wound in core 11a The 1st layer of wire winding layer, and it is online between be closely wound very close to each otherly.2nd coiling W2 the 6th~the 8th circle constitutes quilt Overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, particularly while between the mountain valley being embedded between the 1st coiling W1 line While being wound.For example, the 2nd coiling W2 the 6th circle is located between the mountain valley between the 1st coiling W1 the 5th circle and the 6th circle, the 7th Circle is located between the mountain valley between the 1st coiling W1 the 6th circle and the 7th circle, and the 8th circle is located at the 1st coiling W1 the 7th circle and the 8th circle Between mountain valley between.That is, the position of the axial direction (core 11a long side direction) of the 2nd coiling W2 each circle and the 1st coiling The position of W1 same circle is inconsistent.

As illustrated, the 1st and the 2nd coiling W1 in the 1st coiling block BK1, W2 same circle respectively be located at left side and Right side, maintains the position relationship while closely being wound, but position relationship occurs to overturn on the 2nd coiling block BK2, 1st and the 2nd coiling W1, W2 same circle are located at right side and left side separately from each other, maintain the position relationship while quilt Closely wind.

That is, the core axial direction of the circle of the 1st, the 2nd, the 3rd and the 4th relative to the 1st coiling W1 for constituting the 1st coiling block BK1 Position be respectively the 2nd coiling W2 the circle of the 1st, the 2nd, the 3rd and the 4th left side (close to core 11a one end), constitute the The position of the core axial direction of 2 coiling block BK2 the 1st coiling W1 circle of the 5th, the 6th, the 7th and the 8th is the 2nd coiling W2 respectively The right side of the circle of 5th, the 6th, the 7th and the 8th (close to the core 11a other end).

As previously discussed in order that the 1st and the 2nd coiling W1, W2 position relationship reverse and are necessary from the 1st Intersected two coiling W1, W2 in the way that wrapping range AR1 is moved to the 2nd wrapping range AR2.Above-mentioned area of space S1 makees To make coiling W1, region that W2 is intersected and used.

In addition, in the present embodiment, n-th of the 2nd coiling W2 in the 1st wrapping range AR1₁Circle (n₁For more than 1 m₁-1 Following arbitrary number) with the n-th of the 1st coiling W1₁The 1st wire spacing D between+1 circle₁It is shorter than the n-th of the 1st coiling W1₁Circle with The n-th of 2nd coiling W2₁The 2nd wire spacing D between+1 circle₂.In addition, n-th of the 1st coiling W1 in the 2nd wrapping range AR2₂ Circle (n₂For m₁More than+1 m₁+m₂Arbitrary number below -1) with the n-th of the 2nd coiling W2₂The 3rd wire spacing D between+1 circle₃It is short In the n-th of the 2nd coiling W2₂The n-th of circle and the 1st coiling W1₂The 4th wire spacing D between+1 circle₄。

For example, as shown in Figure 8 A, in the 1st wrapping range AR1, the 2nd coiling W2 the 1st circle is contacted with the 1st coiling W1's 2nd circle, but the 1st coiling W1 the 1st circle is not contacted with the 2nd coiling W2 the 2nd circle.Therefore, the 2nd coiling W2 the 1st circle and the 1st The 1st wire spacing D between coiling W1 the 2nd circle₁It is shorter than between the 1st coiling W1 the 1st circle and the 2nd coiling W2 the 2nd circle 2nd wire spacing D₂.Then, such relation such as Fig. 8 B, shown in Fig. 8 C, between coiling W1, the W2 circles of 2- the 3rd or Also set up between the circles of 3- the 4th.

On the other hand, as shown in Figure 8 A, in the 2nd wrapping range AR2, the 1st coiling W1 the 5th circle is contacted with the 2nd coiling W2 the 6th circle, but the 2nd coiling W2 the 5th circle is not contacted with the 1st coiling W1 the 6th circle.Therefore, the 1st coiling W1 the 5th circle The 3rd wire spacing D between the 2nd coiling W2 the 6th circle₃Be shorter than the 2nd coiling W2 the 5th circle and the 1st coiling W1 the 6th circle it Between the 4th wire spacing D₄.Then, shown in such relation such as Fig. 8 B, Fig. 8 C between coiling W1, the W2 circles of 6- the 7th or Also set up between the circles of 7- the 8th.

As a result, as in fig. 8d, in the 1st wrapping range AR1, the n-th of the 2nd coiling W2₁The of circle and the 1st coiling W1 n₁The Capacitance Coupled of+1 circle becomes strong, and distribution capacity C₂₁Become big.On the other hand, in the 2nd wrapping range AR2, the 1st coiling W1 N-th₂The n-th of circle and the 2nd coiling W2₂The Capacitance Coupled of+1 circle becomes strong, and distribution capacity C₂₂Become big.In a word, across difference Circle between and the distribution capacity (different turn-to-turn capacitance) that produces because relative to coiling W1, W2 both sides equably produce, institute With the imbalance for the impedance that can suppress coiling W1, W2.Therefore, it is possible to reduce patten transformation characteristic Scd and height can be realized The common-mode filter of quality.

In above-mentioned 2nd embodiment, it should by the remaining circle of overlapping the 2nd coiling being wound on the 1st layer of wire winding layer The area of space S1 sides (inner side) between the 1st and the 2nd coiling block are trapped in, but two sides of core can also be trapped in (outside).

Fig. 9 is section for the coiling structure for schematically showing the common-mode filter 3 involved by the 3rd embodiment of the present invention Face figure.In addition, Figure 10 is the ideograph for illustrating the coiling structure of common-mode filter 3.

As shown in figure 9, common-mode filter 3 is characterised by, the 2nd coiling W2 is constituted and is directly wound in core 11a's The 1st layer of wire winding layer on surface, the 1st coiling W1 is wound in the 1st layer of wire winding layer and is constituted the 2nd layer of wire winding layer by overlapping, still, the The remaining circle for not having overlapping the 1st coiling W1 wound on 1 layer of wire winding layer is trapped in core 11a two sides.Implement with the 2nd Mode is identical, m₁=m₂=4.Further, compared with the 2nd embodiment, the 1st and the 2nd coiling W1, W2 upper-lower position top are made On the contrary in order that final wire spacing D₁~D₄Relation it is consistent with the 2nd embodiment, and for convenience of description.1st around Line and the relation of the 2nd coiling are relative relations, for example, make the upper-lower position and the 2nd embodiment phase of the 1st and the 2nd coiling With in the case of, wire spacing D described below₁~D₄Relation changeabout, but do not change the present invention in itself.

In the 1st coiling block BK1, the 2nd coiling W2 the 1st~the 4th circle constitutes the surface for being directly wound in core 11a The 1st layer of wire winding layer, and it is online between be closely wound very close to each otherly.1st coiling W1 the 2nd~the 4th circle constitutes quilt Overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, particularly while between the mountain valley being embedded between the 2nd coiling W2 line While being wound.For example, the 1st coiling W1 the 2nd circle is located between the mountain valley between the 2nd coiling W2 the 1st circle and the 2nd circle, the 3rd Circle is located between the mountain valley between the 2nd coiling W2 the 2nd circle and the 3rd circle, and the 4th circle is located at the 2nd coiling W2 the 3rd circle and the 4th circle Between mountain valley between.That is, the position of the axial direction (core 11a long side direction) of the 1st coiling W1 each circle and the 2nd coiling The position of W2 same circle is inconsistent.

1st coiling W1 the 1st circle and the 8th circle is directly wound in core can not wind not complete remaining circle on the 2nd layer Portion 11a surface simultaneously constitutes the 1st layer of wire winding layer.1st coiling W1 the 1st circle is contacted with the side of the 2nd coiling W2 the 1st circle and quilt Winding, and the part as the 1st coiling block BK1.1st coiling W1 the 8th circle is contacted with the side of the 2nd coiling W2 the 8th circle And wound, and the part as the 2nd coiling block BK2.

It is preferable that 1st coiling W1 the 1st circle and the 8th circle was formed on the 2nd layer originally.But, by the 2nd layer of each circle In the case of being configured between the mountain valley of the 1st layer of adjoining turn-to-turn because lack support the 1st coiling W1 remaining circle the 2nd around One in line W2 2 circles, so the 2nd layer of position can not be maintained.Therefore, as the construction of reality, for the 1st and the 8 circles, using from initially winding the state that is squashed.

In the 2nd coiling block BK2, the 2nd coiling W2 the 5th~the 8th circle constitutes the surface for being directly wound in core 11a The 1st layer of wire winding layer, and it is online between be closely wound very close to each otherly.1st coiling W1 the 5th~the 7th circle constitutes quilt Overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, particularly while between the mountain valley being embedded between the 2nd coiling W2 line While being wound.Specifically, the 1st coiling W1 the 5th circle be located at the 2nd coiling W2 the 5th circle and the 6th circle between mountain valley it Between, the 6th circle be located at the 2nd coiling W2 the 6th circle and the 7th circle between mountain valley between, the 7th circle be located at the 2nd coiling W2 the 7th circle with Between mountain valley between 8th circle.So, the position of the axial direction (core 11a long side direction) of the 1st coiling W1 each circle with The position of 2nd coiling W2 same circle is inconsistent.

As illustrated, the 1st and the 2nd coiling W1 in the 1st coiling block BK1, W2 same circle respectively be located at left side and Right side and the position relationship is maintained while closely being wound, but position relationship is run on the 2nd coiling block BK2 , the 1st and the 2nd coiling W1, W2 same circle are located at right side and left side and while maintain the position relationship separately from each other While closely being wound.

For example, as shown in Figure 10 A, in the 1st wrapping range AR1, the 2nd coiling W2 the 1st circle is contacted with the 1st coiling W1's 2nd circle, but the 1st coiling W1 the 1st circle is not contacted with the 2nd coiling W2 the 2nd circle.Therefore, the 2nd coiling W2 the 1st circle and the 1st The 1st wire spacing D between coiling W1 the 2nd circle₁It is shorter than between the 1st coiling W1 the 1st circle and the 2nd coiling W2 the 2nd circle 2nd wire spacing D₂.Then, shown in such relation such as Figure 10 B, Figure 10 C between coiling W1, the W2 circles of 2- the 3rd or Also set up between the circles of 3- the 4th.

On the other hand, as shown in Figure 10 A, in the 2nd wrapping range AR2, the 1st coiling W1 the 5th circle is contacted with the 2nd coiling W2 the 6th circle, but the 2nd coiling W2 the 5th circle is not contacted with the 2nd coiling W2 the 6th circle.Therefore, the 1st coiling W1 the 5th circle The 3rd wire spacing D between the 2nd coiling W2 the 6th circle₃Be shorter than the 2nd coiling W2 the 5th circle and the 1st coiling W1 the 6th circle it Between the 4th wire spacing D₄.Then, shown in such relation such as Figure 10 B, Figure 10 C between coiling W1, the W2 circles of 6- the 7th Or also set up between the circles of 7- the 8th.

As a result, as shown in Figure 10 D, in the 1st wrapping range AR1, the n-th of the 2nd coiling W2₁Circle and the 1st coiling W1's N-th₁The Capacitance Coupled of+1 circle becomes strong, and distribution capacity C₂₁Become big.On the other hand, in the 2nd wrapping range AR2, the 1st coiling The n-th of W1₂The n-th of circle and the 2nd coiling W2₂The Capacitance Coupled of+1 circle becomes strong, and distribution capacity C₂₂Become big.In a word, across not The distribution capacity (different turn-to-turn capacitance) produced between same circle is because of relative to coiling W1, and W2 both sides equably produce, So the imbalance of coiling W1, W2 impedance can be suppressed.Therefore, it is possible to reduce patten transformation characteristic Scd and can realize The common-mode filter of high-quality.

Common-mode filter 1~3 involved by above-mentioned 1st~the 3rd embodiment, contains coiling W1, W2 position relationship The 1st coiling block BK1 coiling structure and the 2nd coiling block BK2 coiling structure relative to boundary line B be essentially that left and right is right Claim, still, as represented by following, be not required for containing the coiling of coiling W1, W2 position relationship in the present invention The symmetry of construction.

Figure 11 is the sectional view for the coiling structure for representing the common-mode filter 4 involved by the 4th embodiment of the present invention.Separately Outside, Figure 12 is the ideograph for illustrating the coiling structure of common-mode filter 4.

As shown in figure 11, common-mode filter 4 is characterised by, on the 1st layer and the 2nd layer of the 1st coiling block BK1 respectively Using the 1st and the 2nd coiling W1, W2, on the 1st layer and the 2nd layer of the 2nd coiling block BK2 respectively using the 2nd and the 1st around Line W2, W1, make the 1st coiling block BK1 coiling W1 on the 2nd coiling block BK2, and W2 position relationship is spun upside down.In addition, the 1st And the 2nd coiling block BK1, BK2 the final circle of the 2nd layer of coiling is all trapped in core 11a surface as remaining circle. In a word, common-mode filter 4 is characterised by, the 1st coiling with the common-mode filter 2 being combined with involved by the 2nd embodiment 2nd coiling block BK2 of block BK1 and the common-mode filter 3 involved by the 3rd embodiment coiling structure.In the present embodiment It is also m₁=m₂=4.

Area of space S1, the 1st coiling block BK1 and are provided between the 1st wrapping range AR1 and the 2nd wrapping range AR2 2 coiling block BK2 are split by area of space S1.

2nd coiling W2 the 4th circle is directly wound in core 11a surface and constitutes the 1st layer of wire winding layer.2nd coiling W2 the 4th circle is contacted with the side of the 1st coiling W1 the 4th circle and wound, and the part as the 1st coiling block BK1.

1st coiling W1 the 8th circle is directly wound in core 11a surface and constitutes the 1st layer of wire winding layer.1st coiling W1 the 8th circle is contacted with the side of the 2nd coiling W2 the 8th circle and wound, and the part as the 2nd coiling block BK2.

It is preferable that 2nd coiling W2 the 4th circle and the 1st coiling W1 the 8th circle were formed on the 2nd layer originally.But, inciting somebody to action In the case that 2nd layer of each circle is configured between the mountain valley of the 1st layer of adjoining turn-to-turn, because the 2nd layer of 1 circle becomes remaining circle simultaneously And lack one supported in its 1st layer of 2 circles for remaining circle, so the 2nd layer of position can not be maintained.Cause This, as the construction of reality, for the 4th and the 5th circle, using from initially winding the state that is squashed.

In the 2nd coiling block BK2, the 2nd coiling W2 the 5th~the 8th circle constitutes the surface for being directly wound in core 11a The 1st layer of wire winding layer, and it is online between be closely wound very close to each otherly.1st coiling W1 the 5th~the 7th circle constitutes quilt Overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, particularly while between the mountain valley being embedded between the 2nd coiling W2 line While being wound.Such as the 1st coiling W1 the 5th circle is located between the mountain valley between the 2nd coiling W2 the 5th circle and the 6th circle, and the 6th Circle is located between the mountain valley between the 2nd coiling W2 the 6th circle and the 7th circle, and the 7th circle is located at the 2nd coiling W2 the 7th circle and the 8th circle Between mountain valley between.So, the position of the axial direction (core 11a long side direction) of the 1st coiling W1 each circle with the 2nd around The position of line W2 same circle is inconsistent.

Moreover, in the present embodiment, n-th of the 2nd coiling W2 in the 1st wrapping range AR1₁Circle (n₁For more than 1 m₁-1 Following arbitrary number) with the n-th of the 1st coiling W1₁The 1st wire spacing D between+1 circle₁It is shorter than the n-th of the 1st coiling W1₁Circle with The n-th of 2nd coiling W2₁The 2nd wire spacing D between+1 circle₂.In addition, n-th of the 1st coiling W1 in the 2nd wrapping range AR2₂ Circle (n₂For m₁More than+1 m₁+m₂Arbitrary number below -1) with the n-th of the 2nd coiling W2₂The 3rd wire spacing D between+1 circle₃It is short In the n-th of the 2nd coiling W2₂The n-th of circle and the 1st coiling W1₂The 4th wire spacing D between+1 circle₄。

For example, as illustrated in fig. 12, in the 1st wrapping range AR1, the 2nd coiling W2 the 1st circle is contacted with the 1st coiling W1's 2nd circle, but the 1st coiling W1 the 1st circle is not contacted with the 2nd coiling W2 the 2nd circle.Therefore, the 2nd coiling W2 the 1st circle and the 1st The 1st wire spacing D between coiling W1 the 2nd circle₁It is shorter than between the 1st coiling W1 the 1st circle and the 2nd coiling W2 the 2nd circle 2nd wire spacing D₂.Then, shown in such relation such as Figure 12 B, Figure 12 C between coiling W1, the W2 circles of 2- the 3rd or Also set up between the circles of 3- the 4th.

On the other hand, as illustrated in fig. 12, in the 2nd wrapping range AR2, the 1st coiling W1 the 5th circle is contacted with the 2nd coiling W2 the 6th circle, but the 2nd coiling W2 the 5th circle is not contacted with the 1st coiling W1 the 6th circle.Therefore, the 1st coiling W1 the 5th circle The 3rd wire spacing D between the 2nd coiling W2 the 6th circle₃Be shorter than the 2nd coiling W2 the 5th circle and the 1st coiling W1 the 6th circle it Between the 4th wire spacing D₄.Then, shown in such relation such as Figure 12 B, Figure 12 C between coiling W1, the W2 circles of 6- the 7th Or also set up between the circles of 7- the 8th.

As a result, as indicated in fig. 12d, in the 1st wrapping range AR1, the n-th of the 2nd coiling W2₁Circle and the 1st coiling W1's N-th₁The Capacitance Coupled of+1 circle becomes strong, and distribution capacity C₂₁Become big.On the other hand, in the 2nd wrapping range AR2, the 1st coiling The n-th of W1₂The n-th of circle and the 2nd coiling W2₂The Capacitance Coupled of+1 circle becomes strong, and distribution capacity C₂₂Become big.In a word, across not The distribution capacity (different turn-to-turn capacitance) produced between same circle is because of relative to coiling W1, and W2 both sides equably produce, So the imbalance of coiling W1, W2 impedance can be suppressed.Therefore, it is possible to reduce patten transformation characteristic Scd and can realize The common-mode filter of high-quality.

Figure 13 is the coiling structure for schematically showing the common-mode filter 5 involved by the 5th embodiment of the present invention Sectional view.In addition, Figure 14 is the ideograph for illustrating the coiling structure of common-mode filter 5.

As shown in figure 13, common-mode filter 5 is characterised by, on the 1st layer and the 2nd layer of the 1st coiling block BK1 respectively Using the 2nd and the 1st coiling W2, W1, on the 1st layer and the 2nd layer of the 2nd coiling block BK2 respectively using the 1st and the 2nd around Line W1, W2, make the 1st coiling block BK1 coiling W1 on the 2nd coiling block BK2, and W2 position relationship is spun upside down.In addition, the 1st And the 2nd coiling block BK1, BK2 the beginning circle of the 2nd layer of coiling is all trapped in core 11a surface as remaining circle. In a word, common-mode filter 5 is characterised by, the 1st coiling with the common-mode filter 3 being combined with involved by the 3rd embodiment 2nd coiling block BK2 of block BK1 and the common-mode filter 2 involved by the 2nd embodiment coiling structure.In the present embodiment It is also m₁=m₂=4.

In the 1st coiling block BK1, the 2nd coiling W2 the 1st~the 4th circle constitutes the surface for being directly wound in core 11a The 1st layer of wire winding layer, and it is online between be closely wound very close to each otherly.1st coiling W1 the 2nd~the 4th circle constitutes quilt Overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, particularly while between the mountain valley being embedded between the 1st coiling W1 line While being wound.For example, the 1st coiling W1 the 2nd circle is located between the mountain valley between the 2nd coiling W2 the 1st circle and the 2nd circle, the 3rd Circle is located between the mountain valley between the 2nd coiling W2 the 2nd circle and the 3rd circle, and the 4th circle is located at the 2nd coiling W2 the 3rd circle and the 4th circle Between mountain valley between.So, the position of the axial direction (core 11a long side direction) of the 2nd coiling W2 each circle with the 1st around The position of line W1 same circle is inconsistent.

1st coiling W1 the 1st circle is directly wound in core 11a surface and constitutes the 1st layer of wire winding layer.1st coiling W1 the 1st circle is contacted with the side of the 1st circle for the 2nd coiling W2 for constituting the 1st coiling block BK1 and wound, and as the 1st coiling A block BK1 part.

2nd coiling W2 the 5th circle is directly wound in core 11a surface and constitutes the 1st layer of wire winding layer.2nd coiling W2 the 5th circle is contacted with the side of the 5th circle for the 1st coiling W1 for constituting the 2nd coiling block BK2 and wound, and as the 2nd coiling A block BK2 part.

It is preferable that 1st coiling W1 the 1st circle and the 2nd coiling W2 the 5th circle were formed on the 2nd layer originally.But, inciting somebody to action In the case that 2nd layer of each circle is configured between the mountain valley of the 1st layer of adjoining turn-to-turn, because the 2nd layer of 1 circle becomes remaining circle simultaneously And lack one supported in its 1st layer of 2 circles for remaining circle, so the 2nd layer of position can not be maintained.Cause This, as the construction of reality, for the 4th and the 5th circle, using from initially winding the state that is squashed.

In the 2nd coiling block BK2, the 1st coiling W1 the 5th~the 8th circle constitutes the surface for being directly wound in core 11a The 1st layer of wire winding layer, and it is online between be closely wound very close to each otherly.2nd coiling W2 the 6th~the 8th circle constitutes quilt Overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, particularly while between the mountain valley being embedded between the 1st coiling W1 line While being wound.Such as the 2nd coiling W2 the 6th circle is located between the mountain valley between the 1st coiling W1 the 5th circle and the 6th circle, and the 7th Circle is located between the mountain valley between the 1st coiling W1 the 6th circle and the 7th circle, and the 8th circle is located at the 1st coiling W1 the 7th circle and the 8th circle Between mountain valley between.So, the position of the axial direction (core 11a long side direction) of the 1st coiling W1 each circle with the 2nd around The position of line W2 same circle is inconsistent.

For example as shown in Figure 14 A, in the 1st wrapping range AR1, the 2nd coiling W2 the 1st circle is contacted with the 1st coiling W1's 2nd circle, but the 1st coiling W1 the 1st circle is not contacted with the 2nd coiling W2 the 2nd circle.Therefore, the 2nd coiling W2 the 1st circle and the 1st The 1st wire spacing D between coiling W1 the 2nd circle₁It is shorter than between the 1st coiling W1 the 1st circle and the 2nd coiling W2 the 2nd circle 2nd wire spacing D₂.Then, shown in such relation such as Figure 14 B, C between coiling W1, the W2 circles of 2- the 3rd or in 3- Also set up between 4th circle.

On the other hand, as shown in Figure 14 A, in the 2nd wrapping range AR2, the 1st coiling W1 the 5th circle is contacted with the 2nd coiling W2 the 6th circle, but the 2nd coiling W2 the 5th circle is not contacted with the 1st coiling W1 the 6th circle.Therefore, the 1st coiling W1 the 5th circle The 3rd wire spacing D between the 2nd coiling W2 the 6th circle₃Be shorter than the 2nd coiling W2 the 5th circle and the 1st coiling W1 the 6th circle it Between the 4th wire spacing D₄.Then, shown in such relation such as Figure 14 B, C between coiling W1, the W2 circles of 6- the 7th or Also set up between the circles of 7- the 8th.

As a result, as shown in fig. 14d, in the 1st wrapping range AR1, the n-th of the 2nd coiling W2₁Circle and the 1st coiling W1's N-th₁The Capacitance Coupled of+1 circle becomes strong, and distribution capacity C₂₁Become big.On the other hand, in the 2nd wrapping range AR2, the 1st coiling The n-th of W1₂The n-th of circle and the 2nd coiling W2₂The Capacitance Coupled of+1 circle becomes strong, and distribution capacity C₂₂Become big.In a word, across not The distribution capacity (different turn-to-turn capacitance) produced between same circle is because of relative to coiling W1, and W2 both sides equably produce, So the imbalance of coiling W1, W2 impedance can be suppressed.Therefore, it is possible to reduce patten transformation characteristic Scd and can realize The common-mode filter of high-quality.

Figure 15 is the coiling structure for schematically showing the common-mode filter 6 involved by the 6th embodiment of the present invention Sectional view.

Common-mode filter 6 represented by Figure 15 is the variation of the common-mode filter 2 involved by the 2nd embodiment, and it is special Levy and be, the 1st and the 2nd coiling W1, the W2 number of turn is odd number circle (being 9 circles herein).Therefore, the 1st wrapping range BK1 is under The combination for the coiling pattern stated is constituted：By with the 1st number of turn m₁=4 the 1st coiling W1 for being wound in the 1st wrapping range AR1 are constituted The 1st coiling pattern and by equally with the 1st number of turn m₁=4 are wound in the 3rd of the 1st wrapping range AR1 the 2nd coiling W2 compositions Coiling pattern.In addition, the 2nd coiling block BK2 is made up of the combination of following coiling patterns：By with the 2nd number of turn m₂=5 are wound in The 2nd coiling pattern that 2nd wrapping range AR2 the 1st coiling W1 is constituted and by equally with the 2nd number of turn m₂=5 are wound in volume 2 The 4th coiling pattern constituted around region AR2 the 2nd coiling W2.

In the present embodiment, because the 2nd more 1 circles of coiling block BK2, the equilibrium ratio the 1st of different turn-to-turn capacitance is real Apply mode a bit weaker.But, if with it is existing can not obtain the coiling structure of balance completely compared with if, then can The balance of different turn-to-turn capacitance is significantly increased, and its effect is significant.Especially because coiling W1, the W2 number of turn are bigger Then the counterbalance effect of different turn-to-turn capacitance is bigger, so the influence of the difference of 1 circle is diluted and can substantially be ignored and disregard.

The the 1st and the 2nd coiling W1 in 1st coiling block BK1, W2 number of turn m₁With the 1st in the 2nd coiling block BK2 and 2nd coiling W1, W2 number of turn m₂Difference | m₁-m₂| be preferably the 1st coiling W1 (or the 2nd coiling W2) total number of turns 1/4 with Under.For example, in the 1st and the 2nd coiling W1, W2 total number of turns (m₁+m₂) when be 10 circle, the difference of the above-mentioned number of turn | m₁-m₂| (being strictly speaking below 2 circles) below preferably 2.5 circles.This is because, the number of turn difference exceed coiling total number of turns 1/4 In the case of can not ignore its influence, noise reduction becomes insufficient, but in the case of for less than 1/4 both sides around Had no problem in the uneven smaller and practicality of the impedance of line.

Further, the above-mentioned number of turn difference (| m₁-m₂|) regardless of the 1st coiling W1 (or the 2nd coiling W2) total number of turns, more Plus below preferably 2 circles, below particularly preferably 1 circle.If not the intentionally difference of the setting number of turn then in most feelings The difference of the number of turn is big also within 2 circles, and it has been generally acknowledged that can control within 1 circle again under condition.If this is because, in the model In enclosing, then the unbalanced influence of impedance is very small, and there is no compared with the poor situation with no number of turn Change.

Further, present embodiment is to make the 1st and the 2nd coiling W1 of the common-mode filter 2 involved by the 2nd embodiment, The W2 number of turn is the variation in the case of odd number circle, but can also be in the common mode filtering involved by the 3rd~the 5th embodiment Make the 1st and the 2nd coiling W1 in device 3~5, the W2 number of turn is odd number circle.

As shown in figure 16, common-mode filter 7 is characterised by, is further equipped with being configured in and is more leaned on than the 1st coiling block BK1 The 3rd central coiling block BK3 of the long side direction of nearly core, it is configured in than the 2nd coiling block BK2 closer to the long of core Central 4th coiling block BK4, the 3rd and the 4th coiling block BK3 of edge direction, BK4 have individual layer two-wire around set constructor, the 1st around Line block BK1 and the 3rd coiling block BK3 are split by the 1st subspace, and the 2nd coiling block BK2 and the 4th coiling block BK4 are by the 2nd subspace point Cut.Hereinafter, it is described in detail.

Common mode filter membrane ripple device 7 involved by present embodiment is identical with each above-mentioned embodiment, possesses and is wound in drum The core 11a of shape core 11 a pair of coilings W1, W2.1st coiling W1 is from one end of core 11a long side direction towards another End is wound and constitutes the 1st coil in order, and the 2nd coiling W2 is also rolled up in order from core 11a one end towards the other end Around and constitute and mutually magnetic-coupled 2nd coil of the 1st coil.Because the coiling direction of the 1st and the 2nd coil is identical, by flowing To the direction of the magnetic flux produced by the electric current of the 1st coil and the direction as the magnetic flux produced by flowing to the electric current of the 2nd coil Strengthen as identical, overall magnetic flux.1st and the 2nd coil constitutes common-mode filter by structure above.

1st and the 2nd coiling W1, W2 are essentially the identical number of turn, and both preferably even number circle.Present embodiment around Line W1, W2 are 12 circles.Further, the number of turn can be increased as far as possible in order to improve impedance.

A pair of coilings W1, W2 constitute the 1st wrapping range of the side for being arranged at the long side direction positioned at core 11a The 1st coiling block BK1 in AR1, the 3rd coiling block BK3 being equally arranged in the 1st wrapping range AR1, it is arranged at positioned at volume The 2nd coiling block BK2 in 2nd wrapping range AR2 of the another side of core 11a long side direction, equally it is arranged at volume 2 The 4th coiling block BK4 in the AR2 of region.

In the present embodiment, the 1st and the 2nd coiling block BK1, BK2 the 1st and the 2nd coiling W1 are respectively constituted, W2's The number of turn is all 4 circles, respectively constitutes the 3rd and the 4th coiling block BK3, BK4 the 1st and the 2nd coiling W1, the W2 number of turn is all 2 Circle.

1st coiling block BK1 is than the 3rd coiling block BK3 more positioned at a side of core 11a long side direction, the 3rd coiling block BK3 is more located at core 11a center side than the 1st coiling block BK1.Equally, the 2nd coiling block BK2 is than the 4th coiling block BK4 more positions In the another side of core 11a long side direction, the 4th coiling block BK4 is more located in core 11a than the 2nd coiling block BK2 Entreat side.1st coiling block BK1, the 3rd coiling block BK3, the 4th coiling block BK4 and the 2nd coiling block BK2 are from core 11a one end Sequentially it is set by this towards the other end.

Area of space S1 is provided between the 1st wrapping range AR1 and the 2nd wrapping range AR2, in the 1st and the 2nd winding 3rd and the 4th coiling block BK3 adjacent to each other between region AR1, AR2, BK4 are split by area of space S1.Further, in volume 1 In the AR1 of region, the 1st subspace SS1 is arranged between the 1st coiling block BK1 and the 3rd coiling block BK3, and both are empty by the 1st son Between SS1 split.Equally, in the 2nd wrapping range AR2, the 2nd subspace SS2 is arranged at the 2nd coiling block BK2 and the 4th coiling block Between BK4, both are split by the 2nd subspace SS2.

1st coiling block BK1 is made up of the combination of following coiling patterns：By with number of turn m₁₁=4 are wound in the 1st winding area Coiling pattern that domain AR1 the 1st coiling W1 is constituted and by equally with number of turn m₁₁=4 are wound in the 2nd of the 1st wrapping range AR1 The coiling pattern that coiling W2 is constituted.

The the 1st~the 4th circle for constituting the 1st coiling block BK1 the 1st coiling W1 constitutes the table for being directly wound in core 11a The 1st layer of wire winding layer in face, and it is online between be closely wound very close to each otherly.2nd coiling W2 the 1st~the 3rd circle is constituted By overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, particularly while the mountain valley being embedded between the 1st coiling W1 line it Between while being wound.2nd coiling W2 the 4th circle is directly wound in core can not wind not complete remaining circle on the 2nd layer 11a surface simultaneously constitutes the 1st layer of wire winding layer.2nd coiling W2 the 4th circle is contacted with the side of the 1st coiling W1 the 4th circle and rolled up Around, and the part as the 1st coiling block BK1.

2nd coiling block BK2 is made up of the combination of following coiling patterns：By with number of turn m₂₁=4 are wound in the 2nd winding area Coiling pattern that domain AR2 the 1st coiling W1 is constituted and by equally with number of turn m₂₁=4 are wound in the 2nd of the 2nd wrapping range AR2 The coiling pattern that coiling W2 is constituted.

The the 9th~the 12nd circle for constituting the 2nd coiling block BK2 the 1st coiling W1 constitutes the table for being directly wound in core 11a The 1st layer of wire winding layer in face, and it is online between be closely wound very close to each otherly.2nd coiling W2 the 10th~the 12nd circle structure Into by overlapping the 2nd layer of wire winding layer for being wound in the 1st layer of wire winding layer, particularly while being embedded into the mountain valley between the 1st coiling W1 line Between while being wound.2nd coiling W2 the 9th circle is directly wound in core can not wind not complete remaining circle on the 2nd layer 11a surface simultaneously constitutes the 1st layer of wire winding layer.2nd coiling W2 the 9th circle is contacted with the side of the 1st coiling W1 the 9th circle and rolled up Around, and the part as the 2nd coiling block BK2.

It is preferable that 2nd coiling W2 the 4th circle and the 9th circle was formed on the 2nd layer originally.But, by the 2nd layer of each circle In the case of being configured between the mountain valley of the 1st layer of adjoining turn-to-turn because lack support the 2nd coiling W2 remaining circle the 1st around One in line W1 2 circles, so the 2nd layer of position can not be maintained.Therefore, as the construction of reality, for the 4th and the 9 circles, using from initially winding the state that is squashed.

The the 1st and the 2nd coiling block BK1 involved by present embodiment, BK2 coiling structure be represented by Fig. 72 layer by layer Around construction, but can also be using the others 2 represented by Fig. 9, Figure 11 or Figure 13 layer by layer around construction.

Then, to the 3rd and the 4th coiling block BK3, BK4 is illustrated.

In the present embodiment, relative to the 1st and the 2nd coiling block BK1, BK2 by 2 layer by layer around constituting, the 3rd and the 4th Coiling block BK3, BK4 are made up of the two-wire winding of individual layer.Further, the 1st coiling block BK1 and the 3rd coiling block BK3 are by the 1st subspace SS1 is split, and the 2nd coiling block BK2 and the 4th coiling block BK4 are split by the 2nd subspace SS2.

3rd coiling block BK3 is made up of the combination of following coiling patterns：By in the 1st wrapping range AR1 with number of turn m₁₂=2 Coiling pattern that the 1st coiling W1 that is wound is constituted and by equally with number of turn m₁₂=2 are wound in the 2nd of the 1st wrapping range AR1 The coiling pattern that coiling W2 is constituted.The 3rd coiling block BK3 the 1st and the 2nd coiling W1 is constituted, W2 the 5th and the 6th circle is constituted Directly be wound in the two-wire winding of the individual layer on core 11a surface, and it is online between closely rolled up very close to each otherly Around.

4th coiling block BK4 is made up of the combination of following coilings：In the 2nd wrapping range AR2 with number of turn m₂₂=2 are wound The 1st coiling W1 and same with number of turn m₂₂=2 are wound in the 2nd wrapping range AR2 the 2nd coiling W2.Constitute the 4th coiling block BK4 the 1st and the 2nd coiling W1, W2 the 7th and the 8th circle constitute the individual layer on the surface for being directly wound in core 11a Two-wire winding, and it is online between be closely wound very close to each otherly.

Therefore, as illustrated, the 1st coiling W1 is constituted by the 1st number of turn m in the 1st wrapping range AR1₁(m₁=m₁₁+m₁₂) shape Into the 1st coiling pattern WP1, and constituted in the 2nd wrapping range AR2 by the 2nd number of turn m₂(m₂=m₂₁+m₂₂) formed the 2nd Coiling pattern WP2.Equally, the 2nd coiling W2 is constituted by the 1st number of turn m in the 1st wrapping range AR1₁The 3rd coiling pattern formed WP3, and constituted in the 2nd wrapping range AR2 by the 2nd number of turn m₂The 4th coiling pattern WP4 formed.

In the present embodiment, the 1st and the 2nd coiling W1 in the 1st and the 3rd coiling block BK1, BK3, W2 same circle Also it is located at left side and right side respectively, and maintains the position relationship while being wound.In the 4th and the 2nd coiling block The upper position relationship of BK4, BK2 is reversed, the 1st and the 2nd coiling W1, and W2 same circle is located at right side and a left side separately from each other Side, and the position relationship is maintained while being wound.

That is, the position of the core axial direction of the 1st coiling block BK1 the 1st coiling W1 circle of the 1st, the 2nd, the 3rd and the 4th is constituted It is the left side of the 2nd coiling W2 circle of the 1st, the 2nd, the 3rd and the 4th respectively (close to core 11a one end).1st coiling W1's 5th, the position of the core axial direction of the 6th circle is also the 5th of the 2nd coiling W2 the, left side of the 6th circle respectively.

In contrast, constituting the core axle of the 2nd coiling block BK2 the 1st coiling W1 circle of the 9th, the 10th, the 11st and the 12nd To position be respectively the 2nd coiling W2 the circle of the 9th, the 10th, the 11st and the 12nd right side (close to the another of core 11a End).The 7th of 1st coiling W1, the position of the core axial direction of the 8th circle is also the 7th of the 2nd coiling W2 the, right side of the 8th circle respectively.

In addition, in the present embodiment, n-th of the 2nd coiling W2 in the 1st wrapping range AR1₁Circle (n₁For more than 1 m₁-1 Following arbitrary number) with the n-th of the 1st coiling W1₁The 1st wire spacing D between+1 circle₁It is shorter than the n-th of the 1st coiling W1₁Circle with The n-th of 2nd coiling W2₁The 2nd wire spacing D between+1 circle₂.The relation is not only in the 1st coiling block BK1 but also in the 3rd coiling block BK3 is also set up on two pieces of border.In addition, n-th of the 1st coiling W1 in the 2nd wrapping range AR2₂Circle (n₂For m₁It is more than+1 m₁+m₂Arbitrary number below -1) with the n-th of the 2nd coiling W2₂The 3rd wire spacing D between+1 circle₃It is shorter than the 2nd coiling W2's N-th₂The n-th of circle and the 1st coiling W1₂The 4th wire spacing D between+1 circle₄.The relation not only the 2nd coiling block BK2 and also 4th coiling block BK4 is also set up on two pieces of border.

As previously discussed, in the present embodiment, relative to n-th of the 2nd coiling W2 in the 1st wrapping range AR1₁Circle with The n-th of 1st coiling W1₁₊₁The Capacitance Coupled of circle becomes strong and distribution capacity C₂₁Become big, the 1st coiling in the 2nd wrapping range AR2 The n-th of W1₂The n-th of circle and the 2nd coiling W2₂₊₁The Capacitance Coupled of circle becomes strong and distribution capacity C₂₂Become big.In a word, across difference Turn-to-turn and the distribution capacity (different turn-to-turn capacitance) that produces are because relative to coiling W1, W2 both sides equably produce, so energy Enough suppress the imbalance of coiling W1, W2 impedance.Therefore, it is possible to reduce patten transformation characteristic Scd and high-quality can be realized Common-mode filter.

Further, in the present embodiment, make coiling W1 to be switched to the 2nd coiling block BK2 from the 1st coiling block BK1, W2 intersect when, once by 2 layer by layer around be converted into single-layer winding and by subspace be arranged at 2 layer by layer around with single-layer winding it Between, accordingly, because zero it is scrappy multiple spaces are arranged between the 1st coiling block BK1 and the 2nd coiling block BK2 brokenly, so when Make coiling W1 on 1st and the 2nd wrapping range AR1, AR2 border, can shorten from prechiasmal when W2 is intersected The displacement of circle of the circle to after intersecting.That is, space that can be between the wrapping range AR1 of constriction the 1st and the 2nd wrapping range AR2 Region S1 width, and can reduce in the operating winding of coiling and just to have made coiling W1, W2 intersected after circle The deviation of winding start position.Thus, not only the operating winding of coiling becomes spy that is easy but also can reducing common-mode filter The deviation of property.

As shown in figure 17, common-mode filter 8 is characterised by, the 3rd subspace SS3 is arranged to Figure 17 common-mode filter Between 7 the 3rd coiling block BK3 adjoining circle, and the 4th subspace SS4 is arranged between the 4th coiling block BK4 adjoining circle. In the case of present embodiment, because the boundary position difference only one of which place of the adjoining circle in coiling block BK3, BK4, so 3rd and the 4th subspace SS3, SS4 also each only one of which, but in the 3rd and the 4th coiling block BK3, the BK4 number of turn is more In the case of can also be respectively by the 3rd and the 4th subspace SS3, SS4 is arranged at the boundary position of multiple adjacent circles.

So, in the present embodiment, subspace is arranged between the adjoining circle of single-layer winding, accordingly, because entering one Walk zero it is scrappy multiple spaces are arranged between the 1st coiling block BK1 and the 2nd coiling block BK2 brokenly, so when the 1st and the 2nd Make coiling W1 on wrapping range AR1, AR2 border, can further shorten when W2 is intersected from prechiasmal circle to The displacement of circle after intersection.That is, sky that can further between the wrapping range AR1 of constriction the 1st and the 2nd wrapping range AR2 Between region S1 width, and can further to reduce in the operating winding of coiling and just make coiling W1, W2 and carry out intersection The deviation of the winding start position of circle afterwards.Thus, not only the operating winding of coiling becomes easy but also can reduce common mode filter The deviation of the characteristic of ripple device.

As shown in figure 18, common-mode filter 9 is the application examples of the common-mode filter 2 involved by the 2nd embodiment, its feature It is that, by the 1st and the 2nd coiling block BK1 represented by Figure 18, BK2 combination is as unit coiling structure U, by multiple (at this In be 2) unit coiling structure U is arranged on core 11a.There are 2 unit coiling structure U1 in the present embodiment, U2, by the 1st and the 2nd coiling W1, the coiling structure that W2 is constituted is split by 4 coiling blocks.In the 1st and the 2nd coiling W1, W2's In the number of turn very many situation (such as 80 circles) and in the case where being segmented situation about cutting (such as 20 circle × 4), than coarse segmentation Situation (such as 40 circle × 2) can more improve the balance of different turn-to-turn capacitance.Therefore, it is possible to reduce patten transformation characteristic Scd simultaneously And the common-mode filter of high-quality can be realized.

Further, present embodiment is the application examples of the common-mode filter 2 involved by the 2nd embodiment, but as the 1st, The application examples of common-mode filter 1,3~8 involved by 3rd~the 8th embodiment is also possible, and further fits them It is also possible when combining.

Figure 19 is the general plane figure for the detailed construction for representing common-mode filter 21.In addition, Figure 20 is represented by Figure 19 The rough cross-sectional view of common-mode filter 21, A is along A₁~A₁' line sectional view, B is along A₂~A₂' line sectional view.

As shown in Figure 19 and Figure 20, common-mode filter 21 possess by so-called layer around and be wound in the core of cydariform core 11 Portion 11a a pair of coilings W1, W2.1st coiling W1 is directly wound in core 11a surface and constitutes the 1st layer of wire winding layer (the 1 layer), the 2nd coiling W2 removes a part and constituted by the 2nd layer of wire winding layer (the 2nd layer) in the overlapping outside for being wound in the 1st layer.1st Coiling W1 and the 2nd substantially the same numbers of turn of coiling W2 (being 12 circles herein).

By a pair of coiling W1, the coiling structure composition that W2 is constituted is arranged at one of the long side direction positioned at core 11a 1st wrapping range AR1 of side the 1st coiling block BK1, the another side for being arranged at long side direction positioned at core 11a The 2nd wrapping range AR2 the 2nd coiling block BK2.1st coiling W1 the 1st~the 6th circle (the 1st coiling pattern) and the 2nd coiling W2 the 1st~the 6th circle (the 3rd coiling pattern) constitutes the 1st coiling block BK1, the 1st coiling W1 the 7th~the 12nd circle (the 2nd winding diagram Case) and the 2nd coiling W2 the 7th~the 12nd circle (the 4th coiling pattern) constitute the 2nd coiling block BK2.

1st coiling W1 is wound in order from core 11a one end towards the other end.Particularly in volume 1 and the 2nd It is very close to each other between the 1st coiling W1 is online and closely wound in region AR1, AR2.On the other hand, positioned at volume 1 Area of space S1 between region AR1 and the 2nd wrapping range AR2, the 1st coiling block BK1 and the 2nd coiling block are arranged at by space Between BK2.That is, coiling W1 the 1st~the 6th circle is closely wound and space is arranged between the 6th circle and the 7th circle, the 7th~ 12nd circle is closely wound again.

2nd coiling W1 is also wound in order from core 11a one end towards the other end, but while is embedded into by shape While being wound between mountain valley between the coiling W1 of Cheng Yu 1 line.That is, the 2nd coiling W2 is not configured in and its same circle The 1st coiling W1 surface and position of core 11a long side direction is inconsistent mutually.2nd coiling W2 the 1st circle is located at Between mountain valley between 1st coiling W1 the 1st circle and the 2nd circle, it is wound in untill the 5th circle by overlapping by the 1st coiling W1 structures Into wire winding layer on.

2nd coiling W2 the 6th circle is trapped in the space between the 1st coiling block BK1 and the 2nd coiling block BK2 to be contacted with Core 11a surface, and not as the 2nd layer but as the part of the 1st layer.7th circle is also identical with the 6th circle.2nd It is preferable that coiling W2 the 6th circle and the 7th circle were formed on the 2nd layer originally, still, space is being arranged at into the 1st coiling W1's In the case of between 6th circle and the 7th circle because lack support the 2nd coiling W2 the 1st coiling W1 2 circles in one, no It is able to maintain that the 2nd layer of position.Therefore, as the construction of reality, for the 6th and the 7th circle, using what is be squashed from initial winding State.

2nd coiling W2 the 8th~the 12nd circle is again while be embedded between the mountain valley being formed between the 1st coiling W1 line While being wound.2nd coiling W2 the 8th circle is located between the mountain valley between the 1st coiling W1 the 7th circle and the 8th circle, until the 12nd By on the overlapping wire winding layer for being wound in and being made up of the 1st coiling W1 untill circle.

Above is the situation of 12 circles, but become as described below if by its vague generalization.By the 1st with And the 1st and the 2nd coiling W1 in the 2nd wrapping range AR1, AR2, when the W2 number of turn is all set to n (n is positive number), the 1st On the 1st layer of wrapping range AR1, the 1st coiling W1 (the 1st coiling pattern) of n circles and the 2nd coiling W2 (of 1 circle are wound with respectively 3 coiling patterns), in addition, on the 2nd layer of the 1st wrapping range AR1, being wound with the 2nd coiling (the 3rd coiling pattern) of n-1 circles. Equally, on the 1st layer of the 2nd wrapping range AR2, be wound with respectively n circles the 1st coiling W1 (the 2nd coiling pattern) and 1 circle 2 coiling W2 (the 4th coiling pattern), in addition, on the 2nd layer of the 2nd wrapping range AR2, being wound with the 2nd coiling W2 (of n-1 circles 4 coiling patterns).

As illustrated, the 1st coiling block BK1 coiling structure and the 2nd coiling block BK2 coiling structure are relative to boundary line B The shape (symmetrical) being mutually symmetrical with.Coiling W1 in particularly the 1st coiling block BK1, W2 position relationship and the 2nd coiling The position relationship of coiling W1, W2 in block BK2 are symmetrical, still, in the 1st coiling block BK1 and in the 2nd coiling block BK2 The the 1st and the 2nd coiling W1, W2 position relationship is non-symmetrical.

For example, in the relation symmetrical with the 1st coiling block BK1 the 1st coiling W1 the 1st~the 6th circle being the 2nd coiling Block BK2 the 1st coiling W1 the 12nd~the 7th circle, is all the 1st coiling W1.In addition, in the 2nd coiling with the 1st coiling block BK1 The symmetrical relation of W2 the 1st~the 5th circle be the 2nd coiling block BK2 the 2nd coiling W2 the 12nd~the 8th circle, be all the 2nd around Line W2.Further, in the relation symmetrical with the 1st coiling block BK1 the 1st coiling W1 the 6th circle being the 2nd coiling block BK2 1st coiling W1 the 7th circle, is all the 1st coiling W1.Further, symmetry winding start or winding terminate position on how It can be squashed, but so the deviation of some point-symmetry properties is in allowed band.

As previously discussed, by the 1st and the 2nd coiling W1, position relationship of the coiling structure that W2 is constituted comprising coiling is simultaneously In the case of symmetrical, because the distribution capacity (different turn-to-turn capacitance) produced between different circles is equably Coiling W1, W2 both sides are resulted from, so the imbalance of coiling W1, W2 impedance can be suppressed.Therefore, it is possible to reduce Scd (by Noise caused by common mode is converted into differential signal components) and can realize the common-mode filter of high-quality.

Further, as in the present embodiment, can be easy in the case where being arranged at space between the 1st piece and the 2nd piece Symmetrical coiling structure is realized on ground, and can fully reduce the influence of different turn-to-turn capacitance.Therefore, it is possible to fully Reduction Scd simultaneously can realize the common-mode filter of high-quality.

In the above-described embodiment, list left and right symmetry be complete situation, but might not be necessary be It is full symmetric, a part of non-symmetrical portion can also be included.

As shown in figure 21, common-mode filter 22 is characterised by, the 1st and the 2nd coiling W1, and the W2 number of turn is (strange for 13 circles Number circle), the symmetry of coiling structure is squashed on the end of a side of core 11a long side direction.From the 1st to the 12nd It is identical with the 10th embodiment untill circle.In the present embodiment, the 13rd circle, the 13rd of the 1st coiling W1 the are also set up after the 12nd circle Circle (the 5th coiling pattern) and the 2nd coiling W2 the 13rd circle (the 6th coiling pattern) constitute and are arranged at the 3rd wrapping range AR3's 3rd coiling block BK3.

By the 2nd and the 3rd coiling block BK2, BK3 is as in the case of from the point of view of a coiling block BK4, in the 1st coiling block Strict symmetry is not present between BK1 and the 4th coiling block BK4.By the 1st and the 2nd coiling W1, W2 as 13 circles situation Under can not be divided into equalization.But, in the present embodiment, it is divided into 6 circles of left side and the circle of right side 7, so that 6 circles in the circle of right side 7 There is symmetrical relation with 6 circles in left side.The 7th of the 1st~the 6th circle and the 2nd coiling block BK2 in the 1st coiling block BK1 Ensure symmetry between~the 12 circle, the number of turn as the 3rd coiling block BK3 of non-symmetrical portion is fewer, so will not be larger Ground is influenceed by non-symmetrical portion, and can obtain and the 10th embodiment identical effect.

By the 1st and the 2nd coiling W1, the coiling structure that W2 is constituted further is included relative to the 1st and the 2nd coiling block The the 1st and the 2nd coiling W1 in the situation of asymmetrical 3rd coiling block, the 3rd coiling block BK3, W2 (the 5th, the 6th coiling pattern) The number of turn be respectively preferably the 1st and the 2nd coiling W1 in the 1st and the 2nd coiling block BK1, each of BK2, the W2 number of turn Less than half.In the case that W1 for example in the 1st and the 2nd coiling block BK1 as shown in the figure, BK2, the W2 number of turn are all 6 circles, Coiling W1 in 3rd coiling block BK3, the W2 number of turn are respectively preferably below 3 circles.Exceed symmetrical portion in the number of turn of non-symmetrical portion Its influence can not be ignored in the case of the half for the number of turn divided, and noise reduction becomes insufficient, but in half Had no problem in the case of below in the uneven smaller and practicality of the impedance of the coiling of both sides.

The the 1st and the 2nd coiling W1 in 3rd coiling block BK3, the W2 number of turn are regardless of the 1st and the 2nd coiling block BK1, BK2 How is the number of turn of interior coiling, all particularly preferably below 2 circles.If being intentionally intended to be asymmetric, then In most cases it is considered that can converge to the number of turn of non-symmetrical portion within 2 circles, if within the range, Then the unbalanced influence of impedance is very small, and change is there is no compared with the situation without non-symmetrical portion.

As shown in figure 22, common-mode filter 23 is characterised by, the 1st and the 2nd coiling W1, and the W2 number of turn is (strange for 13 circles Number circle), the symmetry of coiling structure is squashed in the central portion of core 11a long side direction.1st and the 2nd coiling W1, W2 the 1st~the 6th circle is identical with the 10th embodiment.The 7th of the 1st coiling W1 is wound with beside the 2nd coiling W2 the 6th circle Circle (the 5th coiling pattern), is wound with the 2nd coiling W2 the 7th circle (the 6th coiling pattern) beside the 1st coiling W1 the 7th circle. 1st and the 2nd coiling W1, W2 the 7th circle are all arranged at the 1st layer, and constitute be arranged at the 3rd of the 3rd wrapping range AR3 around Line block BK3.Afterwards, the 1st and the 2nd coiling W1, W2 the 8th~the 13rd circle and the 7th~the 12nd circle phase in the 10th embodiment With floor-covering roll around.

Using the 1st coiling block BK1 and the 3rd coiling block BK3 the 1st coiling W1 the 7th circle as a coiling block BK4 and It regard the 2nd coiling block BK2 and the 3rd coiling block BK3 the 2nd coiling W2 the 7th circle as the situation from the point of view of another coiling block BK5 Under, strict symmetry is not present between the 4th coiling block BK4 and the 5th coiling block BK5.But, in the 1st coiling block BK1 Ensure symmetry between 1st~the 6th circle and the 2nd coiling block BK2 the 7th~the 12nd circle, be used as the 3rd coiling block of non-symmetrical portion The BK3 number of turn is fewer, thus it is identical with the 11st embodiment, significantly it will not be influenceed by non-symmetrical portion, Neng Gouqu Obtain and the 10th embodiment identical effect.

Further, in the present embodiment, space is not arranged between the 1st coiling block BK1 and the 2nd coiling block BK2, still Can also as the 10th embodiment installation space.Space is being arranged between the 1st coiling block BK1 and the 2nd coiling block BK2 In the case of can easily realize symmetrical coiling structure, and can fully reduce the shadow of different turn-to-turn capacitance Ring, therefore, it is possible to fully reduce Scd and the common-mode filter of high-quality can be realized.

Figure 23 is the general plane figure for the structure for representing the common-mode filter 24 involved by the 13rd embodiment of the present invention. In addition, Figure 24 is the rough cross-sectional view of the common-mode filter 24 represented by Figure 23, A is along A₁~A₁' line sectional view, B is edge A₂~A₂' line sectional view.

As shown in Figure 23 and Figure 24, common-mode filter 24 is characterised by, the 1st is trapped in from the 2nd layer of the 2nd coiling W2 The part that is absorbed in of layer is not the central portion for the long side direction for being arranged at core 11a but is arranged at both ends.

1st coiling W1 is wound in order from core 11a one end towards the other end.Particularly the 1st of the 1st coiling W1 It is very close to each other and closely wound between~the 12 circle is online, it is not provided with the space between the 6th circle and the 7th circle.That is, the 1st The space between line is not provided between coiling block BK1 and the 2nd coiling block BK2.

2nd coiling W2 is also wound in order from core 11a one end towards the other end, but while is embedded into by shape While being wound between mountain valley between the coiling W1 of Cheng Yu 1 line.2nd coiling W2 the 1st circle and the 12nd circle is trapped in the 1st layer simultaneously Core 11a surface is contacted with, is not the 2nd layer but as the part of the 1st layer.

2nd coiling W2 the 2nd circle is located between the mountain valley between the 1st coiling W1 the 1st circle and the 2nd circle, until the 6th circle is Only by the overlapping wire winding layer for being closely wound in and being made up of the 1st coiling W1.6th circle is located at the 5th circle and the 6th of the 1st coiling Between mountain valley between circle.

7th circle flies over 1 next winding position (between mountain valley) and is configured, positioned at the 1st coiling W1 the 7th circle and the 8th Between mountain valley between circle, while being embedded into one between the mountain valley being formed between the 1st coiling W1 line untill the 11st circle While being wound.Final circle is the 12nd circle surface for being trapped in the 1st layer and being contacted with core 11a identical with the 1st circle, from rather than 2nd layer but as the part of the 1st layer.

As illustrated, the 1st coiling block BK1 coiling structure and the 2nd coiling block BK2 coiling structure are relative to boundary line B For mutually symmetrical with shape (symmetrical).Coiling W1 in particularly the 1st coiling block BK1, W2 position relationship and the 2nd coiling The position relationship of coiling W1, W2 in block BK2 are symmetrical.But, in the 1st coiling block BK1 and in the 2nd coiling block BK2 The the 1st and the 2nd coiling W1, W2 position relationship is not symmetrical.

For example, in the relation symmetrical with the 1st coiling block BK1 the 2nd coiling W2 the 1st circle being the 2nd coiling block BK2 The 2nd coiling W2 the 12nd circle, be all the 2nd coiling W2.In addition, in the 1st~the with the 1st coiling block BK1 the 1st coiling W1 The symmetrical relation of 6 circles be the 2nd coiling block BK2 the 1st coiling W1 the 12nd~the 7th circle, be all the 1st coiling W1.Further, place In the relation symmetrical with the 1st coiling block BK1 the 2nd coiling W2 the 2nd~the 6th circle be the 2nd coiling block BK2 the 2nd coiling W2 the 11st~the 7th circle, is all the 2nd coiling W2.Further, how symmetry also can on the position that winding starts or winding terminates It is squashed, but so the deviation of some point-symmetry properties is in allowed band.

As previously discussed, by the 1st and the 2nd coiling W1, position relationship of the coiling structure that W2 is constituted comprising coiling is simultaneously In the case of symmetrical, because different turn-to-turn capacitance are in coiling W1, W2 both sides equably produce, so can suppress The imbalance of coiling W1, W2 impedance.Therefore, it is identical with the 10th embodiment, Scd can be reduced and high-quality can be realized Common-mode filter.

Figure 25 is the general plane figure for the structure for representing the common-mode filter 25 involved by the 14th embodiment of the present invention. In addition, Figure 26 is the rough cross-sectional view of the common-mode filter 25 represented by Figure 25, A is along A₁~A₁' line sectional view, B is edge A₂~A₂' line sectional view.

As shown in Figure 25 and Figure 26, common-mode filter 25 is characterised by, a pair of coilings by so-called two-wire winding by Winding.So-called two-wire winding, refers to that 11 is alternately arranged the 1st and the 2nd coiling W1, W2 method for winding is preferably used to Primary secondary combines closely as necessary situation.1st coiling W1 and the 2nd coiling W2 are in the state of parallel to each other in core Wound on portion 11a long side direction and constitute the 1st layer of wire winding layer.1st coiling W1 and the 2nd coiling W2 is essentially the identical number of turn (being 6 circles herein).

By a pair of coiling W1, the coiling structure that W2 is constituted has a side of the long side direction for being arranged at core 11a The 1st coiling block BK1 and be arranged at core 11a long side direction another side the 2nd coiling block BK2.1st and The the 4th~the 6th circle that 2 coiling W1, W2 the 1st~the 3rd circle constitutes the 1st coiling block BK1, the 1st and the 2nd coiling W1, W2 constitutes the 2nd Coiling block BK2.

In the 1st piece (the 1st~the 3rd circle), the 1st coiling W1 is located at left side, and the 2nd coiling W2 is located at right side, and suitable with this It is closely wound very close to each otherly between sequence is online, but position relationship is overturned in the 2nd piece (the 4th~the 6th circle), the 2nd coiling W2 is located at left side, and the 1st coiling W1 is located at right side, and with the order online between very close to each other be closely wound.

For example, being in the relation symmetrical with the 1st coiling block BK1 the 1st coiling W1 circle of the 1st, the 2nd and the 3rd 2nd coiling block BK2 the 1st coiling W1 circle of the 6th, the 5th and the 4th, is all the 1st coiling W1.In addition, being in and the 1st coiling block The symmetrical relation of BK1 the 2nd coiling W2 circle of the 1st, the 2nd and the 3rd be the 2nd coiling block BK2 the 2nd coiling W2 the 6th, 5th and the 4th circle, is all the 2nd coiling W2.Further, how symmetry can also burst on the position that winding starts or winding terminates Collapse, but so some point-symmetry property deviations are in allowed band.

As previously discussed, by the 1st and the 2nd coiling W1, position relationship of the coiling structure that W2 is constituted comprising coiling is simultaneously In the case of symmetrical, because different turn-to-turn capacitance are relative to coiling W1, W2 both sides equably produce, so can Suppress the imbalance of coiling W1, W2 impedance.Therefore, it is possible to reduce Scd and the common-mode filter of high-quality can be realized.

Further, as in the present embodiment, in the case where being arranged at space between the 1st piece and the 2nd piece, one can be entered Step expands constructs the effect played by symmetrical, and can fully reduce Scd.

The present invention is not limited to the embodiment of the above, as long as without departing from the scope of spirit of the present invention can be with The various changes of increase, these changes are contained in the present invention certainly.

For example, in the above-described embodiment, cydariform core is used as the core that a pair of coilings are wound, but in the present invention Core be not limited to cydariform core, as long as then regardless of shape if the core of the core with relative to a pair of coilings Core be all possible.Also must be not necessarily rectangle on the cross sectional shape of core, hexagon, octagon, circle and Ellipse etc. is all possible.In addition, the number of turn of each coiling can also be more than above-mentioned embodiment.For example, can with layer around It is used as 30~50 circles, and inductance turns into 200~400 μ H or so, can also be used as 15~25 circles with two-wire winding, and Inductance turns into 100~200 μ H.

In addition, in the above-described embodiment, intersected the 1st and the 2nd coiling W1, W2 in area of space S1, but It is coiling W1, the place that W2 is intersected is not limited to area of space S1, for example, can also will be wound in core 11a Before intersected the coiling W1 for shifting to the 2nd wrapping range AR2 movements from area of space S1, W2.Further, coiling W2, W2's Intersect if area of space S1 be able to can also then be omitted if.

In addition, in the above-described embodiment, by the 1st and the 2nd coiling W1 in the 1st wrapping range, W2 the 1st number of turn m₁ It is used as positive integer (4 circles, 6 circles etc.), equally by the 1st and the 2nd coiling W1 in the 2nd wrapping range, W2 the 2nd number of turn m₂As positive integer, but it is positive integer that might not be necessary, if then at will several circles can if positive number.Cause This, even for example the number of turn of an odd lot can also as 4.5 circles.

Claims

1. a kind of common-mode filter, it is characterised in that：

Possess：

Core, with one on long side direction and another end；And

1st and the 2nd coiling, is wound in the core,

1st and the 2nd coiling is from one end of the core towards another described end, from the 1st circle volume Around to N circles,

I-th circle of the 1st coiling is located at the i-th circle than the 2nd coiling closer to one end of the core The position of side, wherein, i is more than 2 below N-2,

I-th -1 circle of the 2nd coiling is located at i-th circle than the 1st coiling closer to described the one of the core The position of individual end side,

I-th -1 circle of the 1st coiling is located at i-th -1 circle than the 2nd coiling closer to described in the core The position of one end side,

The jth circle of 1st coiling is located at than another end described in the jth circle closer to the core of the 2nd coiling The position of portion side, wherein, j is more than i+1 below N-1,

The circle of jth+1 of 2nd coiling is located at the jth circle than the 1st coiling closer to the described another of the core The position of one end side,

The circle of jth+1 of 1st coiling is located at the circle of jth+1 than the 2nd coiling closer to described in the core The position of another end side.

2. common-mode filter as claimed in claim 1, it is characterised in that：

Space is provided between the i-th circle and jth circle of the 1st coiling.

3. common-mode filter as claimed in claim 1 or 2, it is characterised in that：

The i-th -1 circle, the i-th circle, jth circle and the circle of jth+1 of 1st coiling are wound in the 1st layer on the core,

The i-th circle and jth circle of 2nd coiling are wound in described 1st layer,

The i-th -1 circle and the circle of jth+1 of 2nd coiling are wound in the 2nd layer on described 1st layer.

4. common-mode filter as claimed in claim 1 or 2, it is characterised in that：

The i-th -1 circle, the i-th circle, jth circle and the circle of jth+1 of 2nd coiling are wound in described 1st layer.

5. common-mode filter as claimed in claim 1 or 2, it is characterised in that：

I-th -1 circle of the 1st coiling, the i-th circle are wound in the 1st layer on the core,

The i-th circle, jth circle and the circle of jth+1 of 2nd coiling are wound in described 1st layer,

The jth circle and the circle of jth+1 of 1st coiling are wound in the 2nd layer on described 1st layer,

I-th -1 circle of the 2nd coiling is wound in described 2nd layer.

6. common-mode filter as claimed in claim 1, it is characterised in that：

J=i+1.

7. a kind of common-mode filter, it is characterised in that：

Possess：

Core, with one on long side direction and another end；And

1st and the 2nd coiling, is wound in the core,

1st and the 2nd coiling intersects on the core,

The coiling structure of the i-th circle in 1st and the 2nd coiling from the part number of the intersection and towards one end side Make and the coiling structure of the part number from the intersection and i-th circle towards another end side is handed over relative to described The part of fork is symmetrical.

8. common-mode filter as claimed in claim 7, it is characterised in that：

In the part of the intersection, space is provided between the adjoining circle of the 1st and the 2nd coiling.

9. common-mode filter as claimed in claim 7, it is characterised in that：

1st and the 2nd coiling tegillum around.

10. common-mode filter as claimed in claim 9, it is characterised in that：

When 1st and the 2nd coiling is in terms of the part of the intersection, in one end side and another described end Side, the 2nd coiling is wound in the 1st coiling.

11. common-mode filter as claimed in claim 7, it is characterised in that：

1st and the 2nd coiling is by two-wire winding.

12. the common-mode filter as described in any one of claim 7~11, it is characterised in that：

It is also equipped with：

1st flange part of the side being arranged in the axial direction of the core；

2nd flange part of the another side being arranged on the axial direction of the core；

It is arranged at the 1st and the 2nd terminal electrode above the 1st flange part；And

The the 3rd and the 4th terminal electrode above the 2nd flange part is arranged at,

One end of 1st and the 2nd coiling is connected to the 1st and the 2nd terminal electrode respectively,

The other end of 1st and the 2nd coiling is connected to the 3rd and the 4th terminal electrode respectively,

The core have towards with above the direction as above of the 1st and the 2nd flange part,

The upper cross of 1st coiling and the 2nd coiling in the core.

13. a kind of common-mode filter, it is characterised in that：

Possess：

Core, is axially extended；And

1st and the 2nd coiling, is wound in the core,

1st and the 2nd coiling intersects on the core,

1st coiling includes the part number from the intersection and the i-th circle and i+1 towards the side on the axial direction Circle and part number from the intersection and towards the jth circle and the circle of jth+1 of the opposite side on the axial direction,

2nd coiling is comprising the part number from the intersection and the i-th circle towards the side on the axial direction and from institute State the part number of intersection and towards the jth circle of the opposite side on the axial direction,

Position on the axial direction of i-th circle of 2nd coiling is located at i-th circle of the 1st coiling and described Between i+1 circle,

Position on the axial direction of the jth circle of 2nd coiling is located at the jth circle of the 1st coiling and described Between the circle of jth+1.

14. common-mode filter as claimed in claim 13, it is characterised in that：

15. common-mode filter as claimed in claim 13, it is characterised in that：

2nd coiling also comprising the part number from the intersection and the i+1 circle towards the side on the axial direction and From the part number of the intersection and towards the circle of jth+1 of the opposite side on the axial direction,

Position on the axial direction of the i+1 circle of 1st coiling is located at i-th circle and the institute of the 2nd coiling State between i+1 circle,

Position on the axial direction of the circle of jth+1 of 1st coiling is located at the jth circle and the institute of the 2nd coiling State between the circle of jth+1.

16. the common-mode filter as described in any one of claim 13~15, it is characterised in that：

I-th circle of 2nd coiling is wound on i-th circle and the i+1 circle of the 1st coiling,

The jth circle of 2nd coiling is wound on the jth circle and the circle of jth+1 of the 1st coiling.

17. the common-mode filter as described in any one of claim 13~15, it is characterised in that：

The jth circle and the circle of jth+1 of 1st coiling are wound on the jth circle of the 2nd coiling.

18. the common-mode filter as described in any one of claim 13~15, it is characterised in that：

I-th circle of 2nd coiling is on the core to be held in i-th circle and the institute of the 1st coiling The mode for stating i+1 circle is wound,

The jth circle of 2nd coiling is on the core to be held in the jth circle and the institute of the 1st coiling The mode for stating the circle of jth+1 is wound.

19. the common-mode filter as described in any one of claim 13~15, it is characterised in that：

The value of the i and the value of the j are equal.